v3.7.0.1
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale $ 103 $ 80
Total trading investments 719 625
Separate account assets 146,888 149,089
Fair value of collateral held for loan securities 26,269 27,792
Equity Securities/Multi-Asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 408 308
Fair Value, Measurements, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total available-for-sale 103 80
Held-to-maturity securities 74 51
Total trading investments 719 625
Total equity method 935 730
Cost method investments 92 91
Carried interest 19 18
Total investments 1,942 1,595
Separate account assets 146,888 149,089
Fair value of collateral held for loan securities 26,269 27,792
Total investments of consolidated VIEs 1,194 1,008
Total 176,293 179,484
Separate account collateral liabilities under securities lending agreements 26,269 27,792
Other liabilities 225 122
Total liabilities measured at fair value 26,494 27,914
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 trading investments 408 308
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 259 258
Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 280 285
Fair Value, Measurements, Recurring [Member] | Equity And Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 315 328
Fair Value, Measurements, Recurring [Member] | Other Types Of Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 620 402
Total investments of consolidated VIEs 64 63
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 52 59
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 available-for-sale 8 7
Total trading investments 461 368
Total equity method 305 323
Total investments 774 698
Separate account assets 112,370 109,663
Fair value of collateral held for loan securities 20,733 22,173
Total investments of consolidated VIEs 305 281
Total 134,182 132,815
Separate account collateral liabilities under securities lending agreements 20,733 22,173
Total liabilities measured at fair value 20,733 22,173
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities/Multi-asset Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total trading investments 408 308
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 1 1
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 investments of consolidated VIEs 5 3
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity And Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 305 323
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 52 59
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 available-for-sale 72 49
Total trading investments 254 250
Total investments 326 299
Separate account assets 33,545 38,542
Fair value of collateral held for loan securities 5,536 5,619
Total investments of consolidated VIEs 321 276
Total 39,728 44,736
Separate account collateral liabilities under securities lending agreements 5,536 5,619
Other liabilities 7 7
Total liabilities measured at fair value 5,543 5,626
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 254 250
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 investments of consolidated VIEs 5 2
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 available-for-sale 23 24
Total trading investments 4 7
Total investments 27 31
Total investments of consolidated VIEs 113 112
Total 140 143
Other liabilities 218 115
Total liabilities measured at fair value 218 115
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 4 7
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 investments of consolidated VIEs 113 112
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]    
Fair value of collateral held for loan securities 20,733 22,173
Total investments of consolidated VIEs 300 278
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]    
Fair value of collateral held for loan securities 20,733 22,173
Total investments of consolidated VIEs 300 278
Fair Value, Measurements, Recurring [Member] | Debt Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of collateral held for loan securities 5,536 5,619
Total investments of consolidated VIEs 316 274
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]    
Fair value of collateral held for loan securities 5,536 5,619
Total investments of consolidated VIEs 316 274
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 234 108
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 619 399
Total investments 619 399
Total investments of consolidated VIEs 141 152
Total 760 551
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 77 89
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member] | Equity And Fixed Income Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 10 5
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Investment in NAV [Member] | Other Types Of Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 609 394
Total investments of consolidated VIEs 64 63
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]    
Held-to-maturity securities 74 51
Total equity method 11 8
Cost method investments 92 91
Carried interest 19 18
Total investments 196 168
Separate account assets 973 884
Total investments of consolidated VIEs 314 187
Total 1,483 1,239
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 investments of consolidated VIEs 80 79
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Other Types Of Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 11 8
Fair Value, Measurements, Recurring [Member] | Other Assets Not Held at Fair Value [Member] | Carried Interest [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs $ 234 $ 108