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Derivatives (Fair Value Hedges) (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Fixed maturity securities AFS |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | $ (105) | $ (111)
Debt Instruments, Carrying Amount | 445 | 454
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 3 | 3
Mortgages |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Debt Instruments, Carrying Amount | 285 | 359
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | (8) | (11)
Future policy benefits [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Debt Instruments, Carrying Amount | 2,656 | 2,863
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 298 | 191
Policyholder Account Balances [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Debt Instruments, Carrying Amount | 1,720 | 1,911
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | $ 148 | $ 25

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