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Segment Information - Reconciliation of Income (Loss) from Operations by Segment to Consolidated Net Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | $ 18,342 | $ 16,027 | $ 17,963
Interest credited |  | 3,443 | 3,248 | 2,877
Commissions |  | 2,141 | 2,075 | 2,189
General and administrative expenses |  | 2,738 | 2,543 | 2,407
Interest and debt expense |  | 336 | 331 | 283
Total federal income tax expense (benefit) |  | 747 | (396) | 367
Reconciliation of total income (loss) from operations to net income (loss): |  |  |  |
Net annuity product features, pre-tax |  | 2,508 | 68 | 4,133
Net life insurance product features, pre-tax |  | (207) | (393) | 26
Credit loss-related adjustments, pre-tax |  | (152) | (80) | (130)
Investment gains (losses), pre-tax |  | (483) | (959) | 20
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans, pre-tax |  | 535 | (802) | (52)
Gains (losses) on other non-financial assets – sale of subsidiaries/businesses, pre-tax |  | 582 |  |
Impairment of intangibles |  |  |  | (634)
Other items, pre-tax |  | (270) | (55) | (109)
Certain legal accruals, before tax | $ (12) | (129) | (12) | (147)
Severance expense for workforce realignment, before tax |  | (74) | (7) |
Transaction and integration costs for acquisitions or divestiture, before tax |  | (40) | (34) |
Deferred compensation mark-to-market adjustment, before tax |  | (15) | (2) | 38
Income tax benefit (expense) related to the above pre-tax items |  | (553) | 479 | (814)
Net income (loss) |  | 3,275 | (752) | 1,358
Operating Segments and Corporate Non Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | 18,342 | 16,027 | 17,963
Benefits and policyholder liability remeasurement (gain) loss |  | 7,742 | 5,945 | 11,175
Interest credited |  | 3,443 | 3,248 | 2,877
Commissions |  | 2,141 | 2,075 | 2,189
General and administrative expenses |  | 2,524 | 2,533 | 2,298
Interest and debt expense |  | 336 | 331 | 283
Other |  | 615 | 839 | 671
Total operating expenses |  | 16,801 | 14,971 | 19,493
Total federal income tax expense (benefit) |  | 226 | 66 | (448)
Total income (loss) from operations |  | 1,315 | 990 | (1,082)
Other Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | 160 | (755) | 156
Benefits and policyholder liability remeasurement (gain) loss |  | 12 | (866) | 66
Interest credited |  | 32 | 36 | 39
Commissions |  | 0 | 0 | 0
General and administrative expenses |  | 256 | 258 | 267
Interest and debt expense |  | 336 | 331 | 283
Other |  | (10) | (8) | (5)
Total operating expenses |  | 626 | (249) | 650
Total federal income tax expense (benefit) |  | (96) | (112) | (93)
Total income (loss) from operations |  | (370) | (394) | (401)
Annuities | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | 4,896 | 3,002 | 4,482
Benefits and policyholder liability remeasurement (gain) loss |  | 145 | (1,504) | 253
Interest credited |  | 1,536 | 1,252 | 894
Commissions |  | 1,115 | 971 | 1,018
General and administrative expenses |  | 495 | 471 | 408
Interest and debt expense |  | 0 | 0 | 0
Other |  | 217 | 599 | 563
Total operating expenses |  | 3,508 | 1,789 | 3,136
Total federal income tax expense (benefit) |  | 228 | 140 | 185
Total income (loss) from operations |  | 1,160 | 1,073 | 1,161
Life Insurance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | 6,248 | 6,907 | 6,747
Benefits and policyholder liability remeasurement (gain) loss |  | 3,893 | 4,583 | 6,925
Interest credited |  | 1,194 | 1,290 | 1,310
Commissions |  | 461 | 571 | 698
General and administrative expenses |  | 563 | 617 | 554
Interest and debt expense |  | 0 | 0 | 0
Other |  | 242 | 77 | (59)
Total operating expenses |  | 6,353 | 7,138 | 9,428
Total federal income tax expense (benefit) |  | (42) | (72) | (587)
Total income (loss) from operations |  | (63) | (159) | (2,094)
Group Protection | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | 5,717 | 5,563 | 5,304
Benefits and policyholder liability remeasurement (gain) loss |  | 3,692 | 3,732 | 3,931
Interest credited |  | 6 | 5 | 5
Commissions |  | 462 | 446 | 394
General and administrative expenses |  | 870 | 846 | 766
Interest and debt expense |  | 0 | 0 | 0
Other |  | 149 | 155 | 156
Total operating expenses |  | 5,179 | 5,184 | 5,252
Total federal income tax expense (benefit) |  | 113 | 80 | 11
Total income (loss) from operations |  | 425 | 299 | 41
Retirement Plan Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | 1,321 | 1,310 | 1,274
Benefits and policyholder liability remeasurement (gain) loss |  | 0 | 0 | 0
Interest credited |  | 675 | 665 | 629
Commissions |  | 103 | 87 | 79
General and administrative expenses |  | 340 | 341 | 303
Interest and debt expense |  | 0 | 0 | 0
Other |  | 17 | 16 | 16
Total operating expenses |  | 1,135 | 1,109 | 1,027
Total federal income tax expense (benefit) |  | 23 | 30 | 36
Total income (loss) from operations |  | $ 163 | $ 171 | $ 211

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