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Separate Accounts - Summary of Balances and Changes in Separate Account Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | $ 171,483 | $ 158,257 |  |
Reinsurance Agreement | Protective |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 50 | 46 |  |
Variable Annuities |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 120,470 | 113,356 | $ 105,192 | $ 105,573
UL and Other |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 28,921 | 25,150 | 22,642 | 20,920
Retirement Plan Services |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | 22,033 | 19,699 | $ 17,928 | $ 16,996
Other |  |  |  |
Fair Value, Separate Account Investment [Line Items] |  |  |  |
Separate account liabilities | $ 59 | $ 52 |  |

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