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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Balance, Beginning of Period $ 849 $ (369)    
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1,954 1,687    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 175 390    
Other Comprehensive Income (Loss), Tax (426) (436)    
Balance, End of Period 2,552 1,272    
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 83 108 $ (19) $ 69
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax [1] (4,199) (2,800) (4,526) (3,668)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (15) (29) (20) (29)
AOCI, Liability for Future Policy Benefit, after Tax 6,682 3,987 5,412 3,256
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, after Tax 1 6 $ 2 $ 3
Accumulated Translation Adjustment [Member]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax 85 50    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax 17 (11)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax [1] 219 696    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] 175 389    
Other Comprehensive Income (Loss), Tax [1] 67 217    
Accumulated Defined Benefit Plans Adjustment [Member]        
Other Comprehensive Income (Loss), before Reclassifications, before Tax 6 (1)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 1    
Other Comprehensive Income (Loss), Tax (1) 0    
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent        
Other Comprehensive Income (Loss), before Reclassifications, before Tax (1) 4    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax 0 (1)    
AOCI, Liability for Future Policy Benefit, Parent        
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1,645 938    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax $ 375 $ 207    
[1] Includes cash flow hedges of $(572) and $(495) as of September 30, 2025 and December 31, 2024, respectively, and $(229) and $(218) as of September 30, 2024 and December 31, 2023, respectively. See Note 11 – “Derivative Instruments” for additional information on cash flow hedges.