v3.25.4
Fair Value Hierarchy - Summary of Changes in Fair Value for Level 3 Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Investments in credit funds measured at NAV $ 124,182 $ 104,742
Fair Value of Investments 1,739 2,547
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gains/(losses) 19 (8)
Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 14,142 17,138
Net realized gains/(losses) 373 342
Net unrealized gains/(losses) 186 (287)
Purchases 1,189 1,395
Sales (1,165) (916)
Settlements (1,380) (2,322)
Transfers into level 3 1,930 953
Transfers out of level 3 (864) (2,161)
Ending balance 14,411 14,142
Investments in credit funds measured at NAV 122,443 102,195
Investments | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Investments in credit funds measured at NAV 98,462 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 9,570 7,535
Investments | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net realized gains/(losses) 559 55
Investments in credit funds measured at NAV 14,411 14,142
Investments | Corporate debt instruments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 4,510 6,533
Net realized gains/(losses) 180 179
Net unrealized gains/(losses) 55 (169)
Purchases 390 600
Sales (261) (306)
Settlements (631) (1,672)
Transfers into level 3 464 462
Transfers out of level 3 (428) (1,117)
Ending balance 4,279 4,510
Investments in credit funds measured at NAV 7,039 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 139 137
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 2,621 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 4,279 4,510
Investments | Securities backed by real estate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 562 687
Net realized gains/(losses) 7 52
Net unrealized gains/(losses) (136) (82)
Purchases 35 53
Sales (89) (33)
Settlements (51) (114)
Transfers into level 3 7 1
Transfers out of level 3 (29) (2)
Ending balance 306 562
Investments in credit funds measured at NAV 312 569
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
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 6 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 306 562
Investments | Other debt obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 328 244
Net realized gains/(losses) 17 5
Net unrealized gains/(losses) 3 0
Purchases 74 141
Settlements (77) (31)
Transfers out of level 3 0 (31)
Ending balance 345 328
Investments in credit funds measured at NAV 354 403
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 9 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 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 345 328
Investments | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 8,742 9,674
Net realized gains/(losses) 169 106
Net unrealized gains/(losses) 264 (36)
Purchases 690 601
Sales (815) (577)
Settlements (621) (505)
Transfers into level 3 1,459 490
Transfers out of level 3 (407) (1,011)
Ending balance 9,481 8,742
Investments in credit funds measured at NAV 13,157 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 459 574
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 3,217 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 9,481 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 92,049 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 90,582 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 1,467 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
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 7,199 4,110
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 7,195 4,048
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 62
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
Investments | Money market instruments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Investments in credit funds measured at NAV 2,333 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 78 327
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 2,255 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