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Future Contract Benefits - Summary of Changes in Present Values of Expected Net Premiums and LFPB (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Present Value of Expected LFPB |  |  |  |
Net balance as of end-of-period | $ 38,848 |  | $ 39,864 |
Payout Annuities |  |  |  |
Present Value of Expected Net Premiums |  |  |  |
Balance as of beginning-of-year | 0 | $ 0 |  |
Beginning balance at original discount rate | 0 | 0 |  |
Effect of actual variances from expected experience |  |  | 0 | $ 0
Adjusted balance as of beginning-of-year | 0 | 0 |  |
Issuances | 0 | 0 |  |
Interest accrual | 0 | 0 |  |
Net premiums collected | 0 | 0 |  |
Flooring impact of LFPB | 0 | 0 |  |
Ending balance at original discount rate | 0 | 0 |  |
Effect of cumulative changes in discount rate assumptions | 0 | 0 |  |
Balance as of end-of-period | 0 | 0 |  |
Present Value of Expected LFPB |  |  |  |
Balance as of beginning-of-year | 2,085 | 2,004 |  |
Beginning balance of original discount rate | 2,272 | 2,267 |  |
Effect of actual variances from expected experience |  |  | 1 | (1)
Adjusted balance as of beginning-of-year | 2,273 | 2,266 |  |
Issuances | 15 | 27 |  |
Interest accrual | 22 | 21 |  |
Benefit payments | (49) | (46) |  |
Ending balance of original discount rate | 2,261 | 2,268 |  |
Effect of cumulative changes in discount rate assumptions | (227) | (200) |  |
Balance as of end-of-period | 2,034 | 2,068 |  |
Net balance as of end-of-period | 2,034 | 2,068 | 2,085 |
Less: reinsurance recoverables | 1,562 | 3 |  |
Net balance as of end-of-period, net of reinsurance | $ 472 | $ 2,065 |  |
Weighted-average duration of future policyholder benefit liability | 9 years | 9 years |  |
Deferred profit liability | $ 60 | $ 43 |  |
Payout Annuities | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Present Value of Expected Net Premiums |  |  |  |
Balance as of beginning-of-year | 0 | 0 |  |
Present Value of Expected LFPB |  |  |  |
Balance as of beginning-of-year | (187) | (263) |  |
Traditional Life |  |  |  |
Present Value of Expected Net Premiums |  |  |  |
Balance as of beginning-of-year | 6,200 | 6,063 |  |
Beginning balance at original discount rate | 6,348 | 6,645 |  |
Effect of actual variances from expected experience |  |  | 2 | (241)
Adjusted balance as of beginning-of-year | 6,350 | 6,404 |  |
Issuances | 108 | 176 |  |
Interest accrual | 63 | 60 |  |
Net premiums collected | (202) | (203) |  |
Flooring impact of LFPB | 3 | 2 |  |
Ending balance at original discount rate | 6,322 | 6,439 |  |
Effect of cumulative changes in discount rate assumptions | (254) | (230) |  |
Balance as of end-of-period | 6,068 | 6,209 |  |
Present Value of Expected LFPB |  |  |  |
Balance as of beginning-of-year | 10,041 | 9,572 |  |
Beginning balance of original discount rate | 10,230 | 10,357 |  |
Effect of actual variances from expected experience |  |  | 7 | (251)
Adjusted balance as of beginning-of-year | 10,237 | 10,106 |  |
Issuances | 108 | 177 |  |
Interest accrual | 100 | 95 |  |
Benefit payments | (206) | (186) |  |
Ending balance of original discount rate | 10,239 | 10,192 |  |
Effect of cumulative changes in discount rate assumptions | (378) | (302) |  |
Balance as of end-of-period | 9,861 | 9,890 |  |
Net balance as of end-of-period | 3,793 | 3,681 | 3,841 |
Less: reinsurance recoverables | 421 | 520 |  |
Net balance as of end-of-period, net of reinsurance | $ 3,372 | $ 3,161 |  |
Weighted-average duration of future policyholder benefit liability | 9 years | 10 years |  |
Traditional Life | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Present Value of Expected Net Premiums |  |  |  |
Balance as of beginning-of-year | $ (148) | $ (582) |  |
Present Value of Expected LFPB |  |  |  |
Balance as of beginning-of-year | (189) | (785) |  |
Group Protection |  |  |  |
Present Value of Expected Net Premiums |  |  |  |
Effect of cumulative changes in discount rate assumptions |  |  | (490) | (597)
Present Value of Expected LFPB |  |  |  |
Balance as of beginning-of-year | 5,689 | 5,462 |  |
Beginning balance of original discount rate | 6,179 | 6,059 |  |
Effect of actual variances from expected experience |  |  | (67) | (100)
Adjusted balance as of beginning-of-year | 6,112 | 5,959 |  |
Issuances | 408 | 437 |  |
Interest accrual | 48 | 42 |  |
Benefit payments | (382) | (377) |  |
Ending balance of original discount rate | 6,186 | 6,061 |  |
Effect of cumulative changes in discount rate assumptions | (546) | (569) |  |
Balance as of end-of-period | 5,640 | 5,492 |  |
Net balance as of end-of-period | 5,640 |  | 5,689 |
Less: reinsurance recoverables | 123 | 126 |  |
Net balance as of end-of-period, net of reinsurance | $ 5,517 | $ 5,366 |  |
Weighted-average duration of future policyholder benefit liability | 5 years | 4 years |  |
UL and Other |  |  |  |
Present Value of Expected Net Premiums |  |  |  |
Effect of cumulative changes in discount rate assumptions | $ (3,083) | $ (669) | (2,222) | (905)
Present Value of Expected LFPB |  |  |  |
Balance as of beginning-of-year | 15,000 | 14,818 |  |
Balance as of beginning-of-year, excluding shadow balance in AOCI | 17,222 | 15,723 |  |
Effect of actual variances from expected experience |  |  | 106 | $ (9)
Adjusted balance as of beginning-of-year | 17,328 | 15,714 |  |
Interest accrual | 209 | 186 |  |
Net assessments collected | 303 | 336 |  |
Benefit payments | (313) | (183) |  |
Balance as of end-of-year, excluding shadow balance in AOCI | 17,527 | 16,053 |  |
Balance as of end-of-period | 14,444 | 15,384 |  |
Net balance as of end-of-period | 14,444 |  | $ 15,000 |
Less: reinsurance recoverables | 4,776 | 862 |  |
Net balance as of end-of-period, net of reinsurance | $ 9,668 | $ 14,522 |  |
Weighted-average duration of future policyholder benefit liability | 17 years | 17 years |  |

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