v3.19.2
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading securities $ 180 $ 265
Total equity securities at FVTNI 537 452
Separate account assets 96,807 90,285
Total separate account collateral held under securities lending agreements 18,446 20,655
Separate account collateral liabilities under securities lending agreements 18,446 20,655
Equity securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities at FVTNI 515 418
Investments Measured at NAV [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]    
Other assets 63 18
Fair Value, Measurements, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity securities 213 188
Total debt securities 393 453
Total equity securities at FVTNI 537 452
Total equity method 846 781
Federal Reserve Bank Stock 93 92
Carried interest 12 18
Other investments 108  
Total investments 1,989 1,796
Total investments of consolidated VIEs 2,431 2,680
Other assets 168 122
Separate account assets 96,807 90,285
Total separate account collateral held under securities lending agreements 18,446 20,655
Total 119,841 115,538
Borrowings of consolidated VIEs 142 84
Separate account collateral liabilities under securities lending agreements 18,446 20,655
Other liabilities 175 293
Total liabilities measured at fair value 18,763 21,032
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 equity securities at FVTNI 22 34
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 equity securities at FVTNI 515 418
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]    
Trading securities 180 265
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 156 136
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 690 645
Total investments of consolidated VIEs 62 58
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 120 205
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 equity securities at FVTNI 537 452
Total equity method 182 122
Total investments 719 574
Total investments of consolidated VIEs 736 569
Other assets 168 122
Separate account assets 69,029 63,610
Total separate account collateral held under securities lending agreements 12,113 15,066
Total 82,765 79,941
Separate account collateral liabilities under securities lending agreements 12,113 15,066
Total liabilities measured at fair value 12,113 15,066
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 equity securities at FVTNI 22 34
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 equity securities at FVTNI 515 418
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 140 122
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Types Of Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 42  
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 debt securities 178 261
Total investments 178 261
Total investments of consolidated VIEs 959 1,409
Separate account assets 27,001 25,810
Total separate account collateral held under securities lending agreements 6,333 5,589
Total 34,471 33,069
Separate account collateral liabilities under securities lending agreements 6,333 5,589
Other liabilities 7 6
Total liabilities measured at fair value 6,340 5,595
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]    
Trading securities 178 261
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 debt securities 2 4
Total investments 2 4
Total investments of consolidated VIEs 134 152
Total 136 156
Borrowings of consolidated VIEs 142 84
Other liabilities 168 287
Total liabilities measured at fair value 310 371
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]    
Trading securities 2 4
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 9 82
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 736 569
Total separate account collateral held under securities lending agreements 12,113 15,066
Fair Value, Measurements, Recurring [Member] | Equity securities [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 736 569
Total separate account collateral held under securities lending agreements 12,113 15,066
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 429 369
Fair Value, Measurements, Recurring [Member] | Debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 939 1,395
Total separate account collateral held under securities lending agreements 6,333 5,589
Fair Value, Measurements, Recurring [Member] | Debt securities [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 939 1,395
Total separate account collateral held under securities lending agreements 6,333 5,589
Fair Value, Measurements, Recurring [Member] | Bank Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 145 84
Fair Value, Measurements, Recurring [Member] | Bank Loans [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 20 14
Fair Value, Measurements, Recurring [Member] | Bank Loans [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 125 70
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 661 656
Total investments 661 656
Total investments of consolidated VIEs 95 106
Total 756 762
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Equity And 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 16 14
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Other Types Of Investments [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 645 642
Total investments of consolidated VIEs 62 58
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Private/ Public Equity [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 33 48
Fair Value, Measurements, Recurring [Member] | Other [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity securities 213 188
Total debt securities 213 188
Total equity method 3 3
Federal Reserve Bank Stock 93 92
Carried interest 12 18
Other investments 108  
Total investments 429 301
Total investments of consolidated VIEs 507 444
Separate account assets 777 865
Total 1,713 1,610
Fair Value, Measurements, Recurring [Member] | Other [Member] | Other Types Of Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 3 3
Fair Value, Measurements, Recurring [Member] | Other [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs 78 75
Fair Value, Measurements, Recurring [Member] | Other [Member] | Carried Interest [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total investments of consolidated VIEs $ 429 $ 369