v3.26.1
Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period $ 40,429 $ 41,459 $ 41,162 $ 42,550
Change in unrealized appreciation (depreciation) of investments 171 505 (564) 827
Change in other (17) (9) (20) (3)
Change in discount rates 8   13 9
Change in foreign currency translation adjustments (4) 414 (123) 589
Change in net actuarial loss 7 2 14 10
Change in prior service cost 1   2  
Change in deferred tax asset (liability) (57) 4 59 120
Other comprehensive income (loss) 109 916 (619) 1,552
Balance, end of period 40,626 41,529 40,626 41,529
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (5,715) (6,464) (4,987) (7,099)
Other comprehensive income (loss) 109 916 (619) 1,551
Balance, end of period (5,606) (5,548) (5,606) (5,548)
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (4) 0 (3) (4)
Balance, end of period (3) (6) (3) (6)
Unrealized Appreciation (Depreciation) of All Other Investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (1,989) (2,443) (1,373) (2,868)
Balance, end of period (1,881) (1,951) (1,881) (1,951)
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period 91 74 87 68
Other comprehensive income (loss) 5 1 9 7
Balance, end of period 96 75 96 75
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (3,102) (3,328) (2,981) (3,521)
Balance, end of period (3,113) (2,899) (3,113) (2,899)
Retirement Plan Liabilities Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (711) (767) (717) (774)
Balance, end of period (705) (767) (705) (767)
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in unrealized appreciation (depreciation) of investments 1 (7) 0 (3)
Change in deferred tax asset (liability) 0 1 0 1
Other comprehensive income (loss) 1 (6) 0 (2)
Unrealized Appreciation (Depreciation) of All Other Investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in unrealized appreciation (depreciation) of investments 170 512 (564) 830
Change in other (17) (9) (20) (3)
Change in deferred tax asset (liability) (45) (11) 76 90
Other comprehensive income (loss) 108 492 (508) 917
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in discount rates 8   13 9
Change in deferred tax asset (liability) (3) 1 (4) (2)
Other comprehensive income (loss) 5 1 9 7
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in foreign currency translation adjustments (4) 414 (123) 589
Change in deferred tax asset (liability) (7) 15 (9) 34
Other comprehensive income (loss) (11) 429 (132) 623
Retirement Plan Liabilities Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in net actuarial loss 7 2 14 10
Change in prior service cost 1   2  
Change in deferred tax asset (liability) (2) (2) (4) (3)
Other comprehensive income (loss) $ 6 $ 0 $ 12 7
Less: Noncontrolling interests        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests       1
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests       0
Unrealized Appreciation (Depreciation) of All Other Investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests       0
Change in the discount rates used to measure traditional and limited payment long-duration insurance contracts        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests       0
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests       1
Retirement Plan Liabilities Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests       $ 0