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Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | $ 168,438 | $ 158,257 |
Protective | Reinsurance Agreement |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 49 | 46 |
Variable Annuities |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 117,998 | 113,356 | $ 105,573
UL and Other |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 28,841 | 25,150 | 20,920
Retirement Plan Services |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | 21,541 | 19,699 | $ 16,996
Other |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |
Separate account liabilities | $ 58 | $ 52 |

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