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Insurance (Aggregate FV of Assets Supporting Separate Accounts) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Separate Account, Liability [Line Items] |  |
Separate account assets | $ 87,440 | $ 84,965
Equity securities |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | 87,164 | 84,667
Fixed maturity securities |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | 260 | 278
Cash and cash equivalents |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | 9 | 9
Other |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | $ 7 | $ 11

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