v3.26.3
Equity - Rollforward 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 $ 11,373 $ 13,169 $ 13,960 $ 12,326
Other comprehensive income (loss) (5,077) 1,605 (5,792) 4,654
Less: Noncontrolling interests 0 0 0 1
Balance, end of period 7,426 14,322 7,426 14,322
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (10,167) (10,633) (9,452) (13,681)
Other comprehensive income (loss) (5,077) 1,605 (5,792) 4,653
Balance, end of period (15,244) (9,028) (15,244) (9,028)
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 (37) (17) (29) (43)
Other comprehensive income (loss) 10 (7)    
Balance, end of period (27) (24) (27) (24)
Unrealized appreciation (depreciation) of all Other Investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (12,951) (13,483) (11,656) (16,229)
Other comprehensive income (loss) (6,650) 2,020    
Balance, end of period (19,601) (11,463) (19,601) (11,463)
Change in fair value of market risk benefits attributable to changes in our own credit risk        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (853) (724) (1,116) (690)
Other comprehensive income (loss) 272 (264)    
Balance, end of period (581) (988) (581) (988)
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 3,704 3,429 3,250 3,342
Other comprehensive income (loss) 1,635 (154)    
Balance, end of period 5,339 3,275 5,339 3,275
Cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period (59) 136 66 (46)
Other comprehensive income (loss) (341) 4    
Balance, end of period (400) 140 (400) 140
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period 27 24 31 (17)
Other comprehensive income (loss) (3) 6    
Balance, end of period 24 30 24 30
Retirement plan liabilities adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period 2 2 2 2
Other comprehensive income (loss) 0 0    
Balance, end of period 2 2 2 2
Noncontrolling interests        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests 0 0 0 1
Foreign Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Less: Noncontrolling interests 0 0 0 1
AOCI Including Portion Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in unrealized appreciation (depreciation) of investments (8,546) 2,405 (10,063) 6,009
Change in fair value of market risk benefits attributable to changes in our own credit risk 347 (337) 682 (381)
Change in discount rates assumptions of certain liabilities 2,087 (196) 2,668 (86)
Change in future policy benefits and other 204 (69) 233 (102)
Change in cash flow hedges (436) 6 (596) 238
Change in foreign currency translation adjustments (4) 9 (8) 55
Change in deferred tax asset (liability) 1,271 (213) 1,292 (1,079)
Other comprehensive income (loss) (5,077) 1,605 (5,792) 4,654
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 13 (8) 3 25
Change in future policy benefits and other   (1)   (1)
Change in deferred tax asset (liability) (3) 2 (1) (5)
Other comprehensive income (loss) 10 (7) 2 19
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 (8,559) 2,413 (10,066) 5,984
Change in future policy benefits and other 204 (68) 233 (101)
Change in deferred tax asset (liability) 1,705 (325) 1,888 (1,117)
Other comprehensive income (loss) (6,650) 2,020 (7,945) 4,766
Change in fair value of market risk benefits attributable to changes in our own credit risk        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in fair value of market risk benefits attributable to changes in our own credit risk 347 (337) 682 (381)
Change in deferred tax asset (liability) (75) 73 (147) 83
Other comprehensive income (loss) 272 (264) 535 (298)
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 assumptions of certain liabilities 2,087 (196) 2,668 (86)
Change in deferred tax asset (liability) (452) 42 (579) 19
Other comprehensive income (loss) 1,635 (154) 2,089 (67)
Cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in cash flow hedges (436) 6 (596) 238
Change in deferred tax asset (liability) 95 (2) 130 (52)
Other comprehensive income (loss) (341) 4 (466) 186
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Change in foreign currency translation adjustments (4) 9 (8) 55
Change in deferred tax asset (liability) 1 (3) 1 (7)
Other comprehensive income (loss) $ (3) $ 6 (7) 48
Retirement Plan Liabilities Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Other comprehensive income (loss)     $ 0 $ 0