v3.26.1
Derivatives (Fair Value Hedges) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Maximum Length of Time Hedged in Cash Flow Hedge 3 years 3 years
Future policy benefits [Member] | Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Debt Instruments, Carrying Amount $ (2,473) $ (2,509)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 326 319
Policyholder Account Balances [Member] | Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Debt Instruments, Carrying Amount (2,355) (2,498)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 105 (35)
Fixed Maturities [Member] | Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (61) (73)
Debt Instruments, Carrying Amount (1,346) (120)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) $ 0 $ 0