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Separate Accounts - Schedule of Reconciliation of Separate Account Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | $ 158,257 |
Balance as of end-of-period | 166,225 |
Variable Annuities |  |
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | 113,356 | $ 105,573
Gross deposits | 904 | 624
Withdrawals | (3,208) | (2,436)
Policyholder assessments | (648) | (624)
Change in market performance | 7,503 | 5,054
Net transfers from (to) general account | 269 | 143
Balance as of end-of-period | 118,176 | 108,334
Cash surrender value | 116,771 | 106,796
UL and Other |  |
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | 25,150 | 20,920
Gross deposits | 358 | 394
Withdrawals | (103) | (75)
Policyholder assessments | (246) | (238)
Change in market performance | 1,885 | 1,193
Net transfers from (to) general account | (37) | (32)
Balance as of end-of-period | 27,007 | 22,162
Cash surrender value | 24,606 | 19,863
Retirement Plan Services |  |
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | 19,699 | 16,996
Gross deposits | 570 | 554
Withdrawals | (732) | (586)
Policyholder assessments | (44) | (40)
Change in market performance | 1,475 | 978
Net transfers from (to) general account | 18 | (26)
Balance as of end-of-period | 20,986 | 17,876
Cash surrender value | $ 20,971 | $ 17,862

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