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Future Policy Benefits (Rollforward of Unpaid Claims) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, beginning of period $ 16,118 $ 16,468
Less: Reinsurance recoverables 2,790 2,592
Net balance, beginning of period 13,328 13,876
Incurred related to:    
Current period 22,050 20,532
Prior periods (1) 164 80
Total incurred 22,214 20,612
Paid related to:    
Current period (15,202) (14,470)
Prior periods (5,712) (5,773)
Total paid (20,914) (20,243)
Net balance, end of period 14,628 14,245
Add: Reinsurance recoverables 2,974 2,757
Balance, end of period (included in FPBs and other policy-related balances) $ 17,602 $ 17,002