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Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | $ 162,506 | $ 168,438 |  |
Reinsurance Agreement | Protective |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 47 | 49 |  |
Variable Annuities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 113,635 | 117,998 | $ 118,176 | $ 113,356
UL and Other |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 28,106 | 28,841 | 27,007 | 25,150
Retirement Plan Services |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 20,708 | 21,541 | $ 20,986 | $ 19,699
Other |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | $ 57 | $ 58 |  |

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