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Separate Accounts (Schedule of Reconciliation of Separate Account Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | $ 148,421 | $ 143,536 |
UL and Other [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 22,162 | 20,920 | $ 24,785
Variable Annuities [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 108,334 | 105,573 | 136,665
Retirement Plan Services [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 17,876 | 16,996 | $ 21,068
Other Operations [Member] |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | $ 49 | $ 47 |

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