Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Trading securities	$ 1,871	$ 1,331
Equity securities at FVTNI, Carrying Value	1,585	1,211
Separate account assets	56,098	54,066
Separate account collateral liabilities under securities lending agreements	4,558	5,765
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	80	86
Equity securities Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Equity securities at FVTNI, Carrying Value	1,585	1,211
Fair Value, Measurements, Recurring Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Held-to-maturity investments	617	544
Total debt securities	2,488	1,875
Total equity method	2,756	1,895
Bank loans	205	354
Federal Reserve Bank Stock	92	91
Carried interest	1,975	1,550
Other investments	639	490
Total investments	9,740	7,466
Other assets	256	146
Separate account assets	56,098	54,066
Total separate account collateral held under securities lending agreements	4,558	5,765
Total	70,652	67,443
Separate account collateral liabilities under securities lending agreements	4,558	5,765
Other liabilities	296	311
Total liabilities measured at fair value	4,854	6,076
Fair Value, Measurements, Recurring Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Trading securities	0	0
Held-to-maturity investments	0	0
Total debt securities	0	0
Equity securities at FVTNI, Carrying Value		0
Bank loans		0
Federal Reserve Bank Stock		0
Carried interest		0
Other assets		0
Separate account assets		0
Total separate account collateral held under securities lending agreements		0
Separate account collateral liabilities under securities lending agreements	0	0
Other liabilities	0	0
Total liabilities measured at fair value	0	0
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 debt securities	0	0
Total equity method	246	181
Bank loans	0	0
Federal Reserve Bank Stock	0	0
Carried interest	0	0
Other investments	15	28
Total investments	1,846	1,420
Other assets	117	145
Separate account assets	34,621	34,823
Total separate account collateral held under securities lending agreements	1,686	2,163
Total	38,270	38,551
Separate account collateral liabilities under securities lending agreements	1,686	2,163
Other liabilities	0	0
Total liabilities measured at fair value	1,686	2,163
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	1,829	1,279
Equity securities at FVTNI, Carrying Value		0
Total equity method	0	0
Bank loans	30	106
Federal Reserve Bank Stock	0	0
Carried interest	0	0
Other investments	0	0
Total investments	1,859	1,385
Other assets	19	1
Separate account assets	20,810	18,544
Total separate account collateral held under securities lending agreements	2,872	3,602
Total	25,560	23,532
Separate account collateral liabilities under securities lending agreements	2,872	3,602
Other liabilities	17	31
Total liabilities measured at fair value	2,889	3,633
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	42	52
Equity securities at FVTNI, Carrying Value		0
Total equity method	0	0
Bank loans	175	248
Federal Reserve Bank Stock	0	0
Carried interest	0	0
Other investments	0	0
Total investments	217	300
Other assets	120	0
Separate account assets	0	0
Total separate account collateral held under securities lending agreements	0	0
Total	337	300
Separate account collateral liabilities under securities lending agreements	0	0
Other liabilities	279	280
Total liabilities measured at fair value	279	280
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	1,871	1,331
Fair Value, Measurements, Recurring Member | Debt Securities/ 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
Trading securities	0	0
Held-to-maturity investments	0	0
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	1,829	1,279
Held-to-maturity investments	0	0
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	42	52
Held-to-maturity investments	0	0
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 at FVTNI, Carrying Value	1,585	1,211
Fair Value, Measurements, Recurring Member | Equity Securities/Mutual Funds Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Equity securities at FVTNI, Carrying Value	0
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 at FVTNI, Carrying Value	1,585	1,211
Fair Value, Measurements, Recurring Member | Equity Securities/Mutual Funds Member | Significant Other Observable Inputs (Level 2) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Equity securities at FVTNI, Carrying Value	0
Fair Value, Measurements, Recurring Member | Equity Securities/Mutual Funds Member | Significant Unobservable Inputs (Level 3) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Equity securities at FVTNI, Carrying Value	0
Fair Value, Measurements, Recurring Member | Equity, Fixed Income And Multi-Asset Mutual Funds Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	246	181
Fair Value, Measurements, Recurring Member | Equity, Fixed Income And Multi-Asset Mutual Funds 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 | Equity, Fixed Income And 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 equity method	246	181
Fair Value, Measurements, Recurring Member | Equity, Fixed Income And 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 equity method	0	0
Fair Value, Measurements, Recurring Member | Equity, Fixed Income And 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 equity method	0	0
Fair Value, Measurements, Recurring Member | Hedge Funds/Funds of Hedge Funds/Other Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	588	525
Fair Value, Measurements, Recurring Member | Hedge Funds/Funds of Hedge Funds/Other 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	0	0
Fair Value, Measurements, Recurring Member | Hedge Funds/Funds of Hedge Funds/Other Member | Significant Other Observable Inputs (Level 2) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Hedge Funds/Funds of Hedge Funds/Other Member | Significant Unobservable Inputs (Level 3) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Private equity funds member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	1,264	885
Fair Value, Measurements, Recurring Member | Private equity 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	0	0
Fair Value, Measurements, Recurring Member | Private equity funds member | Significant Other Observable Inputs (Level 2) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Private equity funds member | Significant Unobservable Inputs (Level 3) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
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	417	304
Fair Value, Measurements, Recurring Member | Real Assets 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	0	0
Fair Value, Measurements, Recurring Member | Real Assets Funds Member | Significant Other Observable Inputs (Level 2) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Real Assets Funds Member | Significant Unobservable Inputs (Level 3) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Investments Related To Deferred Cash Compensation Plans Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	241
Fair Value, Measurements, Recurring Member | Investments Related To Deferred Cash Compensation Plans 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	0
Fair Value, Measurements, Recurring Member | Investments Related To Deferred Cash Compensation Plans Member | Significant Other Observable Inputs (Level 2) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0
Fair Value, Measurements, Recurring Member | Investments Related To Deferred Cash Compensation Plans Member | Significant Unobservable Inputs (Level 3) 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 | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	2,510	1,714
Bank loans	0
Federal Reserve Bank Stock	0
Carried interest	0
Other investments	467	316
Total investments	2,977	2,030
Other assets	0
Separate account assets	0
Total separate account collateral held under securities lending agreements	0
Total	2,977	2,030
Fair Value, Measurements, Recurring Member | Investments Measured at NAV Member | Hedge Funds/Funds of Hedge Funds/Other Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	588	525
Fair Value, Measurements, Recurring Member | Investments Measured at NAV Member | Private equity funds member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	1,264	885
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	417	304
Fair Value, Measurements, Recurring Member | Investments Measured at NAV Member | Investments Related To Deferred Cash Compensation Plans Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	241
Fair Value, Measurements, Recurring Member | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Trading securities	0	0
Held-to-maturity investments	617	544
Total debt securities	617	544
Equity securities at FVTNI, Carrying Value		0
Total equity method	0	0
Bank loans	0	0
Federal Reserve Bank Stock	92	91
Carried interest	1,975	1,550
Other investments	157	146
Total investments	2,841	2,331
Other assets	0	0
Separate account assets	667	699
Total separate account collateral held under securities lending agreements	0	0
Total	3,508	3,030
Separate account collateral liabilities under securities lending agreements	0	0
Other liabilities	0	0
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring Member | Other [Member] | Equity Securities/Mutual Funds Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Equity securities at FVTNI, Carrying Value	0
Fair Value, Measurements, Recurring Member | Other [Member] | Equity, Fixed Income And Multi-Asset Mutual Funds Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Other [Member] | Hedge Funds/Funds of Hedge Funds/Other Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Other [Member] | Private equity funds member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Other [Member] | Real Assets Funds Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0	0
Fair Value, Measurements, Recurring Member | Other [Member] | Investments Related To Deferred Cash Compensation Plans Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total equity method	0
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	1,686	2,163
Fair Value, Measurements, Recurring Member | Equity securities Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements		0
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	1,686	2,163
Fair Value, Measurements, Recurring Member | Equity 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	0	0
Fair Value, Measurements, Recurring Member | Equity securities Member | Significant Unobservable Inputs (Level 3) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements	0	0
Fair Value, Measurements, Recurring Member | Equity securities Member | Investments Measured at NAV Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements	0
Fair Value, Measurements, Recurring Member | Equity securities Member | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements	0	0
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	2,872	3,602
Fair Value, Measurements, Recurring Member | Debt securities Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements		0
Fair Value, Measurements, Recurring Member | Debt 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	0	0
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	2,872	3,602
Fair Value, Measurements, Recurring Member | Debt securities Member | Significant Unobservable Inputs (Level 3) Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements	0	0
Fair Value, Measurements, Recurring Member | Debt securities Member | Investments Measured at NAV Member | Investment in NAV Member
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements	0
Fair Value, Measurements, Recurring Member | Debt securities Member | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Line Items
Total separate account collateral held under securities lending agreements	$ 0	$ 0