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Separate Accounts (Schedule of Fair Value of Separate Account Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 148,421 | $ 143,536
Separate Account, Mutual Funds And Collective Investment Trusts [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 147,765 | 142,892
Separate Account Exchange-traded Funds [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 214 | 258
Separate Account, Fixed maturity AFS securities [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 173 | 169
Separate Account, Cash and Invested Cash [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 145 | 98
Separate Account, Other Investments [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 124 | 119
Reinsurance Agreement [Member] |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 43 | $ 42

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