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Fair Value Hierarchy - Summary of Changes in Fair Value for Level 3 Investments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV $ 129,176   $ 129,176   $ 104,742
Fair Value of Investments 1,946   1,946   2,547
Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Net realized gains/(losses) 2 $ (18) 32 $ (8)  
Investments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 14,604 15,702 14,142 17,138  
Net realized gains/(losses) 95 83 246 296  
Net unrealized gains/(losses) 88 189 357 (20)  
Purchases 130 338 1,141 1,014  
Sales (380) (47) (702) (694)  
Settlements (315) (635) (937) (1,862)  
Transfers into level 3 1,099 341 1,602 892  
Transfers out of level 3 (319) (582) (847) (1,375)  
Ending balance 15,002 15,389 15,002 15,389  
Investments in credit funds measured at NAV 127,230   127,230   102,195
Investments | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 104,719   104,719   80,518
Investments | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 7,509   7,509   7,535
Investments | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Net realized gains/(losses) 183 272 603 (276)  
Investments in credit funds measured at NAV 15,002   15,002   14,142
Investments | Corporate debt instruments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 4,418 5,660 4,510 6,533  
Net realized gains/(losses) 62 47 143 196  
Net unrealized gains/(losses) (3) 31 124 (45)  
Purchases 67 107 251 417  
Sales (62) (3) (133) (149)  
Settlements (187) (402) (437) (1,320)  
Transfers into level 3 382 96 497 389  
Transfers out of level 3 (138) (332) (416) (817)  
Ending balance 4,539 5,204 4,539 5,204  
Investments in credit funds measured at NAV 7,208   7,208   7,276
Investments | Corporate debt instruments | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 172   172   137
Investments | Corporate debt instruments | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 2,497   2,497   2,629
Investments | Corporate debt instruments | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 4,539   4,539   4,510
Investments | Securities backed by real estate          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 509 565 562 687  
Net realized gains/(losses) 3 2 8 46  
Net unrealized gains/(losses) (14) 6 (41) (74)  
Purchases 11 2 28 45  
Sales (88) 0 (88) (33)  
Settlements (16) (5) (36) (101)  
Transfers into level 3 0 0 0 1  
Transfers out of level 3 0 0 (28) (1)  
Ending balance 405 570 405 570  
Investments in credit funds measured at NAV 416   416   569
Investments | Securities backed by real estate | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 0   0   0
Investments | Securities backed by real estate | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 11   11   7
Investments | Securities backed by real estate | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 405   405   562
Investments | Other debt obligations          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 356 221 328 244  
Net realized gains/(losses) 1 1 5 4  
Net unrealized gains/(losses) 6 2 6 1  
Purchases 3 160 43 163  
Settlements (20) (27) (36) (55)  
Ending balance 346 357 346 357  
Investments in credit funds measured at NAV 357   357   403
Investments | Other debt obligations | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 11   11   22
Investments | Other debt obligations | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 0   0   53
Investments | Other debt obligations | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 346   346   328
Investments | Equity securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 9,321 9,256 8,742 9,674  
Net realized gains/(losses) 29 33 90 50  
Net unrealized gains/(losses) 99 150 268 98  
Purchases 49 69 819 389  
Sales (230) (44) (481) (512)  
Settlements (92) (201) (428) (386)  
Transfers into level 3 717 245 1,105 502  
Transfers out of level 3 (181) (250) (403) (557)  
Ending balance 9,712 $ 9,258 9,712 $ 9,258  
Investments in credit funds measured at NAV 13,263   13,263   12,647
Investments | Equity securities | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 382   382   574
Investments | Equity securities | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 3,169   3,169   3,331
Investments | Equity securities | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 9,712   9,712   8,742
Investments | U.S.          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 97,305   97,305   75,410
Investments | U.S. | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 97,305   97,305   75,410
Investments | U.S. | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 0   0   0
Investments | U.S. | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 0   0   0
Investments | Non-U.S. government and agency obligations          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 6,697   6,697   4,110
Investments | Non-U.S. government and agency obligations | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 6,657   6,657   4,048
Investments | Non-U.S. government and agency obligations | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 40   40   62
Investments | Non-U.S. government and agency obligations | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 0   0   0
Investments | Money market instruments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 1,984   1,984   1,780
Investments | Money market instruments | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 192   192   327
Investments | Money market instruments | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 1,792   1,792   1,453
Investments | Money market instruments | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV $ 0   $ 0   $ 0