v3.26.1
Fair Value Hierarchy - Summary of Changes in Fair Value for Level 3 Investments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV $ 179,979   $ 179,979   $ 124,182
Fair Value of Investments 1,751   1,751   1,739
Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Net realized gains/(losses) (5) $ 15 (6) $ 26  
Investments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 14,349 14,549 14,411 14,142  
Net realized gains/(losses) 84 87 159 159  
Net unrealized gains/(losses) (93) 183 (275) 287  
Purchases 207 239 722 507  
Sales (279) (301) (412) (323)  
Settlements (335) (376) (797) (571)  
Transfers into level 3 1,382 672 1,392 1,228  
Transfers out of level 3 (723) (449) (608) (825)  
Ending balance 14,592 14,604 14,592 14,604  
Investments in credit funds measured at NAV 178,228   178,228   122,443
Investments | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 152,565   152,565   98,462
Investments | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 11,071   11,071   9,570
Investments | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Net realized gains/(losses) (9) 270 (116) 446  
Investments in credit funds measured at NAV 14,592   14,592   14,411
Investments | Corporate debt instruments          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 4,597 4,696 4,279 4,510  
Net realized gains/(losses) 40 41 89 80  
Net unrealized gains/(losses) (10) 92 (65) 101  
Purchases 40 68 104 169  
Sales (31) (111) (64) (77)  
Settlements (159) (122) (351) (220)  
Transfers into level 3 421 115 620 366  
Transfers out of level 3 (513) (361) (227) (511)  
Ending balance 4,385 4,418 4,385 4,418  
Investments in credit funds measured at NAV 6,455   6,455   7,039
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 167   167   139
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 1,903   1,903   2,621
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 4,385   4,385   4,279
Investments | Securities backed by real estate          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 309 532 306 562  
Net realized gains/(losses) 1 13 2 13  
Net unrealized gains/(losses) (3) (24) (5) (31)  
Purchases 4 15 8 20  
Sales (1) 0 (1) 0  
Settlements (2) (24) (2) (27)  
Transfers into level 3 2 0 2 0  
Transfers out of level 3 0 (3) 0 (28)  
Ending balance 310 509 310 509  
Investments in credit funds measured at NAV 314   314   312
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 4   4   6
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 310   310   306
Investments | Other debt obligations          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 294 356 345 328  
Net realized gains/(losses) 2 2 3 4  
Net unrealized gains/(losses) 1 1 0 1  
Purchases 12 8 9 39  
Sales (3) 0 (3) 0  
Settlements (17) (11) (65) (16)  
Ending balance 289 356 289 356  
Investments in credit funds measured at NAV 293   293   354
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 4   4   9
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   0
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 289   289   345
Investments | Equity securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 9,149 8,965 9,481 8,742  
Net realized gains/(losses) 41 31 65 62  
Net unrealized gains/(losses) (81) 114 (205) 216  
Purchases 151 148 601 279  
Sales (244) (190) (344) (246)  
Settlements (157) (219) (379) (308)  
Transfers into level 3 959 557 770 862  
Transfers out of level 3 (210) (85) (381) (286)  
Ending balance 9,608 $ 9,321 9,608 $ 9,321  
Investments in credit funds measured at NAV 13,425   13,425   13,157
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 399   399   459
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 3,418   3,418   3,217
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 9,608   9,608   9,481
Investments | U.S.          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 144,396   144,396   92,049
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 140,709   140,709   90,582
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 3,687   3,687   1,467
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 obligations          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 11,244   11,244   7,199
Investments | Non-U.S. government obligations | Level 1          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 11,240   11,240   7,195
Investments | Non-U.S. government obligations | Level 2          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Investments in credit funds measured at NAV 4   4   4
Investments | Non-U.S. government 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 2,101   2,101   2,333
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 46   46   78
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 2,055   2,055   2,255
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