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Derivatives (Fair Value Hedges) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 77	$ 86
Fixed maturity securities AFS | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	(73)	(91)
Debt Instruments, Carrying Amount	238	241
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	0	0
Mortgages | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt Instruments, Carrying Amount	51	130
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	0	(1)
Future policy benefits [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt Instruments, Carrying Amount	2,511	2,583
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	277	359
Policyholder Account Balances [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Debt Instruments, Carrying Amount	2,528	2,170
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	$ (15)	$ 223

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