v3.22.1
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading securities $ 1,132 $ 1,186
Equity securities/mutual funds 1,769 1,738
Separate account assets 75,353 86,226
Separate account collateral liabilities under securities lending agreements 7,083 7,081
Equity securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities/mutual funds 1,769 1,738
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 29 22
Fair Value, Measurements, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity investments 460 430
Total debt securities 1,592 1,616
Total equity method 1,797 1,694
Bank loans 292 284
Federal Reserve Bank Stock 96 96
Carried interest 1,778 1,555
Other investments 291 279
Total investments 7,615 7,262
Other assets 200 234
Separate account assets 75,353 86,226
Total separate account collateral held under securities lending agreements 7,083 7,081
Total 90,251 100,803
Separate account collateral liabilities under securities lending agreements 7,083 7,081
Other liabilities 347 368
Total liabilities measured at fair value 7,430 7,449
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 method 261 245
Total investments 2,030 1,983
Other assets 181 195
Separate account assets 48,288 54,675
Total separate account collateral held under securities lending agreements 2,903 3,717
Total 53,402 60,570
Separate account collateral liabilities under securities lending agreements 2,903 3,717
Total liabilities measured at fair value 2,903 3,717
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 1,124 1,169
Bank loans 28 14
Other investments 12  
Total investments 1,164 1,183
Other assets 19 39
Separate account assets 26,271 30,786
Total separate account collateral held under securities lending agreements 4,180 3,364
Total 31,634 35,372
Separate account collateral liabilities under securities lending agreements 4,180 3,364
Other liabilities 35 26
Total liabilities measured at fair value 4,215 3,390
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 8 17
Bank loans 264 270
Other investments 4 5
Total investments 276 292
Total 276 292
Other liabilities 312 342
Total liabilities measured at fair value 312 342
Fair Value, Measurements, Recurring [Member] | Equity Securities/Mutual Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity securities/mutual funds 1,769 1,738
Fair Value, Measurements, Recurring [Member] | Equity Securities/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]    
Equity securities/mutual funds 1,769 1,738
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 1,132 1,186
Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading securities 1,124 1,169
Fair Value, Measurements, Recurring [Member] | Debt Securities/ Fixed Income Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Trading securities 8 17
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 261 245
Fair Value, Measurements, Recurring [Member] | Equity And Fixed Income 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 equity method 261 245
Fair Value, Measurements, Recurring [Member] | Hedge Funds/Funds of Hedge Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 433 369
Fair Value, Measurements, Recurring [Member] | Private/ Public Equity [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 847 846
Fair Value, Measurements, Recurring [Member] | Real Assets Funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 256 234
Fair Value, Measurements, Recurring [Member] | Equity securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total separate account collateral held under securities lending agreements 2,903 3,717
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 separate account collateral held under securities lending agreements 2,903 3,717
Fair Value, Measurements, Recurring [Member] | Debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total separate account collateral held under securities lending agreements 4,180 3,364
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 separate account collateral held under securities lending agreements 4,180 3,364
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 1,536 1,449
Other investments 95 96
Total investments 1,631 1,545
Total 1,631 1,545
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Hedge Funds/Funds of Hedge Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 433 369
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 equity method 847 846
Fair Value, Measurements, Recurring [Member] | Investments Measured at NAV [Member] | Real Assets Funds [Member] | Investment in NAV [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity method 256 234
Fair Value, Measurements, Recurring [Member] | Other [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Held-to-maturity investments 460 430
Total debt securities 460 430
Federal Reserve Bank Stock 96 96
Carried interest 1,778 1,555
Other investments 180 178
Total investments 2,514 2,259
Separate account assets 794 765
Total $ 3,308 $ 3,024