v3.26.3
Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period $ 40,626 $ 41,529 $ 41,162 $ 42,550
Change in unrealized appreciation (depreciation) of investments (2,046) 543 (2,610) 1,370
Change in other 5 20 (15) 17
Change in discount rates 15 7 28 16
Change in foreign currency translation adjustments 78 (52) (45) 537
Change in net actuarial loss 7 8 21 18
Change in prior service cost 1 1 3 1
Change in deferred tax asset (liability) 92 (25) 151 95
Total other comprehensive income (loss) (1,848) 502 (2,467) 2,054
Balance, end of period 38,909 41,117 38,909 41,117
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (5,606) (5,548) (4,987) (7,099)
Total other comprehensive income (loss) (1,848) 502 (2,467) 2,053
Balance, end of period (7,454) (5,046) (7,454) (5,046)
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 (3) (6) (3) (4)
Balance, end of period 1 (6) 1 (6)
Unrealized Appreciation (Depreciation) of All Other Investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (1,881) (1,951) (1,373) (2,868)
Balance, end of period (3,841) (1,404) (3,841) (1,404)
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 96 75 87 68
Total other comprehensive income (loss) 12 5 21 12
Balance, end of period 108 80 108 80
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (3,113) (2,899) (2,981) (3,521)
Balance, end of period (3,023) (2,955) (3,023) (2,955)
Retirement Plan Liabilities Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (705) (767) (717) (774)
Balance, end of period (699) (761) (699) (761)
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 5 0 5 (3)
Change in deferred tax asset (liability) (1) 0 (1) 1
Total other comprehensive income (loss) 4 0 4 (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 (2,051) 543 (2,615) 1,373
Change in other 5 20 (15) 17
Change in deferred tax asset (liability) 86 (16) 162 74
Total other comprehensive income (loss) (1,960) 547 (2,468) 1,464
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 15 7 28 16
Change in deferred tax asset (liability) (3) (2) (7) (4)
Total other comprehensive income (loss) 12 5 21 12
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in foreign currency translation adjustments 78 (52) (45) 537
Change in deferred tax asset (liability) 12 (4) 3 30
Total other comprehensive income (loss) 90 (56) (42) 567
Retirement Plan Liabilities Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in net actuarial loss 7 8 21 18
Change in prior service cost 1 1 3 1
Change in deferred tax asset (liability) (2) (3) (6) (6)
Total other comprehensive income (loss) $ 6 $ 6 $ 18 13
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