v3.26.3
Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, Beginning of Period $ 2,682 $ 849    
Other Comprehensive Income (Loss), before Reclassifications, before Tax (3,837) 1,954    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 394 175    
Other Comprehensive Income (Loss), Tax 721 (426)    
Balance, End of Period (40) 2,552    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 119 83 $ 121 $ (19)
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax [1] (11,001) (4,199) (4,807) (4,526)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax 0 (15) (6) (20)
AOCI, Liability for Future Policy Benefit, after Tax 10,839 6,682 7,372 5,412
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, after Tax 3 1 $ 2 $ 2
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax (3) 85    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax 1 17    
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax [1] (8,258) 219    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] 386 175    
Other Comprehensive Income (Loss), Tax [1] (1,678) 67    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0 6    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 8 0    
Other Comprehensive Income (Loss), Tax (2) (1)    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1 (1)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax 0 0    
AOCI, Liability for Future Policy Benefit, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax 4,423 1,645    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax $ 956 $ 375    
[1] Includes cash flow hedges of $(1,105) million and $(748) million as of September 30, 2026 and December 31, 2025, respectively, and $(572) million and $(495) million as of September 30, 2025 and December 31, 2024, respectively. See Note 11 – “Derivative Instruments” for additional information on cash flow hedges.