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Separate Accounts - Schedule of Reconciliation of Separate Account Liabilities (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | $ 158,257 |
Balance as of end-of-period | 171,483 |
Variable Annuities |  |
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | 113,356 | $ 105,573
Gross deposits | 3,002 | 2,137
Withdrawals | (10,190) | (7,402)
Policyholder assessments | (1,970) | (1,883)
Change in market performance | 15,664 | 6,320
Net transfers from (to) general account | 608 | 447
Balance as of end-of-period | 120,470 | 105,192
Cash surrender value | 119,106 | 103,729
UL and Other |  |
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | 25,150 | 20,920
Gross deposits | 1,058 | 1,178
Withdrawals | (347) | (227)
Policyholder assessments | (742) | (714)
Change in market performance | 3,945 | 1,573
Net transfers from (to) general account | (143) | (88)
Balance as of end-of-period | 28,921 | 22,642
Cash surrender value | 26,498 | 20,324
Retirement Plan Services |  |
Separate Account, Liability [Roll Forward] |  |
Balance as of beginning-of-year | 19,699 | 16,996
Gross deposits | 1,751 | 1,576
Withdrawals | (2,382) | (1,795)
Policyholder assessments | (134) | (121)
Change in market performance | 3,065 | 1,316
Net transfers from (to) general account | 34 | (44)
Balance as of end-of-period | 22,033 | 17,928
Cash surrender value | $ 22,018 | $ 17,914

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