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Policyholder Account Balances (Schedule of Policyholder Account Balances) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | $ 116,167 | $ 114,435 |
UL and Other [Member] |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | 37,533 | 37,694 | $ 38,200
Variable Annuities [Member] |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | 23,771 | 22,184 | 19,148
Fixed Annuities [Member] |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | 24,019 | 23,365 | 22,552
Retirement Plan Services [Member] |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | 24,994 | 25,138 | $ 23,579
Other Operations [Member] |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | 5,850 | 6,054 |
Reinsurance Agreement [Member] |  |  |
Policyholder Account Balance [Line Items] |  |  |
Policyholder account balances | $ 5,400 | $ 5,700 |

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