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Policyholder Account Balances - Schedule of Policyholder Account Balances (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 125,262 | $ 126,197 |  |
Variable Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 34,370 | 35,267 | $ 31,408 | $ 29,141
Fixed Annuities |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 26,039 | 25,963 | 25,162 | 25,355
UL and Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 36,220 | 36,599 | 37,006 | 37,180
Retirement Plan Services |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 23,479 | 23,619 | $ 23,586 | $ 23,784
Other |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | 5,154 | 4,749 |  |
Other | Reinsurance Agreement |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |
Policyholder account balances | $ 4,300 | $ 4,400 |  |

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