v3.3.1.900
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale $ 44 $ 201
Total trading investments 785 536
Separate account assets 150,851 161,287
Fair value of collateral held for loan securities 31,336 33,654
Borrowings of consolidated VIEs 4,930 4,922
Equity Securities/Multi-Asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 279 239
Fair Value, Measurements, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 785 536
Deferred compensation plan equity method investments 14 21
Cost method investments 95 96
Carried interest 19 85
Total investments 1,578 1,921
Separate account assets 150,851 161,287
Fair value of collateral held for loan securities 31,336 33,654
Total investments of consolidated VIEs 1,030 3,352
Total 184,795 200,214
Separate account collateral liabilities under securities lending agreements 31,336 33,654
Other liabilities 54 44
Total liabilities measured at fair value 31,390 37,087
Borrowings of consolidated VIEs   3,389
Fair Value, Measurements, Recurring [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 513 633
Fair Value, Measurements, Recurring [Member] | Equity/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 278 239
Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 442 233
Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method   29
Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total consolidated sponsored investment funds   270
Total investments of consolidated VIEs 351 13
Fair Value, Measurements, Recurring [Member] | Equity And Fixed Income Mutual Funds | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 103  
Fair Value, Measurements, Recurring [Member] | Other Types Of Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 58  
Fair Value, Measurements, Recurring [Member] | Other Types Of Investments | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 410 604
Fair Value, Measurements, Recurring [Member] | Bank Loans and Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   3,292
Fair Value, Measurements, Recurring [Member] | Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   47
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Plan Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 65 64
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 345 314
Deferred compensation plan equity method investments 0 0
Cost method investments 0 0
Carried interest 0 0
Total investments 437 650
Separate account assets 109,761 113,566
Fair value of collateral held for loan securities 26,062 30,387
Total investments of consolidated VIEs 304 0
Total 136,564 144,603
Separate account collateral liabilities under securities lending agreements 26,062 30,387
Other liabilities 0 0
Total liabilities measured at fair value 26,062 30,387
Borrowings of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 73 127
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 278 239
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 2 11
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method   29
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total consolidated sponsored investment funds   11
Total investments of consolidated VIEs 6 0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity And Fixed Income Mutual Funds | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 73  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Types Of Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Types Of Investments | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0 98
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bank Loans and Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Deferred Compensation Plan Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 65 64
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 438 222
Deferred compensation plan equity method investments 0 0
Cost method investments 0 0
Carried interest 0 0
Total investments 440 236
Separate account assets 40,152 46,866
Fair value of collateral held for loan securities 5,274 3,267
Total investments of consolidated VIEs 246 2,990
Total 46,112 53,359
Separate account collateral liabilities under securities lending agreements 5,274 3,267
Other liabilities 6 5
Total liabilities measured at fair value 5,280 3,272
Borrowings of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 438 222
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method   0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total consolidated sponsored investment funds   11
Total investments of consolidated VIEs 4 3
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity And Fixed Income Mutual Funds | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Types Of Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Types Of Investments | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Bank Loans and Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   2,958
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   29
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Deferred Compensation Plan Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 2 0
Deferred compensation plan equity method investments 0 0
Cost method investments 0 0
Carried interest 0 0
Total investments 25 80
Separate account assets 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 196 320
Total 221 400
Separate account collateral liabilities under securities lending agreements 0 0
Other liabilities 48 39
Total liabilities measured at fair value 48 3,428
Borrowings of consolidated VIEs   3,389
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 2 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method   0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total consolidated sponsored investment funds   80
Total investments of consolidated VIEs 196 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity And Fixed Income Mutual Funds | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Types Of Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Types Of Investments | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0 0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Bank Loans and Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   302
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   18
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Deferred Compensation Plan Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Deferred compensation plan equity method investments 14 21
Cost method investments 0 0
Carried interest 0 0
Total investments 444 682
Separate account assets 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 203 10
Total 647 692
Separate account collateral liabilities under securities lending agreements 0 0
Other liabilities 0 0
Total liabilities measured at fair value 0 0
Borrowings of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 430 493
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Equity/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method   0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total consolidated sponsored investment funds   168
Total investments of consolidated VIEs 145 10
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Equity And Fixed Income Mutual Funds | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 30  
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Other Types Of Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 58  
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Other Types Of Investments | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 400 493
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Bank Loans and Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Investments Measured At NAV [Member] | Deferred Compensation Plan Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Deferred compensation plan equity method investments 0 0
Cost method investments 95 96
Carried interest 19 85
Total investments 232 273
Separate account assets 938 855
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 81 32
Total 1,251 1,160
Separate account collateral liabilities under securities lending agreements 0 0
Other liabilities 0 0
Total liabilities measured at fair value 0 0
Borrowings of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 10 13
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Debt Securities/ Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method   0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total consolidated sponsored investment funds   0
Total investments of consolidated VIEs 0 0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Equity And Fixed Income Mutual Funds | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 0  
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Other Types Of Investments    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Other Types Of Investments | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 10 13
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Bank Loans and Other Assets [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   32
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Bonds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs   0
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Deferred Compensation Plan Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 0 0
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 44 201
Fair value of collateral held for loan securities 26,062 30,387
Total investments of consolidated VIEs 298  
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 19 198
Fair value of collateral held for loan securities 26,062 30,387
Total investments of consolidated VIEs 298  
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 2 3
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 23 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member] | Investments Measured At NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Equity Securities/Multi-Asset Mutual Funds [Member] | Other Assets Not Held at Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Debt Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity debt securities 108 79
Fair value of collateral held for loan securities 5,274 3,267
Total investments of consolidated VIEs 242  
Fair Value, Measurements, Recurring [Member] | Debt Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity debt securities 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Debt Securities | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity debt securities 0 0
Fair value of collateral held for loan securities 5,274 3,267
Total investments of consolidated VIEs 242  
Fair Value, Measurements, Recurring [Member] | Debt Securities | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity debt securities 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Debt Securities | Investments Measured At NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity debt securities 0 0
Fair value of collateral held for loan securities 0 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Debt Securities | Other Assets Not Held at Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity debt securities 108 79
Fair value of collateral held for loan securities 0 $ 0
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 81  
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member] | Investments Measured At NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 0  
Fair Value, Measurements, Recurring [Member] | Carried Interest [Member] | Other Assets Not Held at Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs $ 81