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Policyholder Account Balances, Future Policy Benefits and Claims - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]      
Balance $ 9,236 $ 9,117  
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance 1,847 1,953  
Beginning balance at original discount rate 1,905 1,950  
Effect of changes in cash flow assumptions   0 $ 73
Effect of actual variances from expected experience   (27) (55)
Adjusted beginning of year balance   1,878 1,968
Issuances 50 273  
Interest accrual 23 97  
Net premiums collected (90) (433)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,861 1,905  
Effect of changes in discount rate assumptions (40) (58)  
Ending balance 1,821 1,847  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 9,258 9,711  
Beginning balance at original discount rate 9,585 9,641  
Effect of changes in cash flow assumptions   0 40
Effect of actual variances from expected experience   (47) (97)
Adjusted beginning of year balance   9,538 9,584
Issuances 50 273  
Interest accrual 120 486  
Benefit payments (184) (758)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 9,524 9,585  
Effect of changes in discount rate assumptions (222) (327)  
Ending balance 9,302 9,258  
Adjustment due to reserve flooring 7 7  
Net liability for future policy benefits 7,488 7,418  
Less: reinsurance recoverable 3,809 3,794  
Net liability for future policy benefits, after reinsurance recoverable 3,679 3,624  
Discounted expected future gross premiums 3,730 3,755  
Expected future gross premiums 5,726 5,830  
Expected future benefit payments 15,410 15,553  
Life Contingent Payout Annuities      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance 0 0  
Beginning balance at original discount rate 0 0  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   0 0
Adjusted beginning of year balance   0 0
Issuances 36 201  
Interest accrual 0 1  
Net premiums collected (36) (202)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 0 0  
Effect of changes in discount rate assumptions 0 0  
Ending balance 0 0  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 1,204 1,164  
Beginning balance at original discount rate 1,289 1,222  
Effect of changes in cash flow assumptions   0 (24)
Effect of actual variances from expected experience   (2) (8)
Adjusted beginning of year balance   1,287 1,190
Issuances 36 201  
Interest accrual 14 56  
Benefit payments (41) (158)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,296 1,289  
Effect of changes in discount rate assumptions (71) (85)  
Ending balance 1,225 1,204  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 1,225 1,204  
Less: reinsurance recoverable 746 759  
Net liability for future policy benefits, after reinsurance recoverable 479 445  
Discounted expected future gross premiums 0 0  
Expected future gross premiums 0 0  
Expected future benefit payments $ 1,860 $ 1,846  
Weighted average interest accretion rate 4.50% 4.50%  
Weighted average discount rate 5.30% 5.40%  
Weighted average duration of liability (in years) 6 years 6 years  
Term and Whole Life Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 737 $ 703  
Beginning balance at original discount rate 774 708  
Effect of changes in cash flow assumptions   0 57
Effect of actual variances from expected experience   (7) (16)
Adjusted beginning of year balance   767 749
Issuances 12 63  
Interest accrual 9 38  
Net premiums collected (19) (76)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 769 774  
Effect of changes in discount rate assumptions (30) (37)  
Ending balance 739 737  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 1,322 1,325  
Beginning balance at original discount rate 1,353 1,291  
Effect of changes in cash flow assumptions   0 67
Effect of actual variances from expected experience   (9) (16)
Adjusted beginning of year balance   1,344 1,342
Issuances 12 63  
Interest accrual 19 73  
Benefit payments (26) (125)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,349 1,353  
Effect of changes in discount rate assumptions (18) (31)  
Ending balance 1,331 1,322  
Adjustment due to reserve flooring 7 7  
Net liability for future policy benefits 599 592  
Less: reinsurance recoverable 430 424  
Net liability for future policy benefits, after reinsurance recoverable 169 168  
Discounted expected future gross premiums 1,669 1,672  
Expected future gross premiums 2,882 2,921  
Expected future benefit payments $ 2,275 $ 2,286  
Weighted average interest accretion rate 6.10% 6.00%  
Weighted average discount rate 5.50% 5.60%  
Weighted average duration of liability (in years) 7 years 7 years  
Disability Income Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 53 $ 104  
Beginning balance at original discount rate 59 105  
Effect of changes in cash flow assumptions   0 (39)
Effect of actual variances from expected experience   (4) (13)
Adjusted beginning of year balance   55 53
Issuances 2 9  
Interest accrual 1 3  
Net premiums collected (1) (6)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 57 59  
Effect of changes in discount rate assumptions (5) (6)  
Ending balance 52 53  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 545 661  
Beginning balance at original discount rate 535 621  
Effect of changes in cash flow assumptions   0 (61)
Effect of actual variances from expected experience   (8) (25)
Adjusted beginning of year balance   527 535
Issuances 2 9  
Interest accrual 8 34  
Benefit payments (10) (43)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 527 535  
Effect of changes in discount rate assumptions 15 10  
Ending balance 542 545  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 490 492  
Less: reinsurance recoverable 20 20  
Net liability for future policy benefits, after reinsurance recoverable 470 472  
Discounted expected future gross premiums 832 836  
Expected future gross premiums 1,178 1,196  
Expected future benefit payments $ 885 $ 899  
Weighted average interest accretion rate 6.30% 6.30%  
Weighted average discount rate 5.50% 5.60%  
Weighted average duration of liability (in years) 7 years 7 years  
Long Term Care Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 1,057 $ 1,146  
Beginning balance at original discount rate 1,072 1,137  
Effect of changes in cash flow assumptions   0 55
Effect of actual variances from expected experience   (16) (26)
Adjusted beginning of year balance   1,056 1,166
Issuances 0 0  
Interest accrual 13 55  
Net premiums collected (34) (149)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,035 1,072  
Effect of changes in discount rate assumptions (5) (15)  
Ending balance 1,030 1,057  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 6,187 6,561  
Beginning balance at original discount rate 6,408 6,507  
Effect of changes in cash flow assumptions   0 58
Effect of actual variances from expected experience   (28) (48)
Adjusted beginning of year balance   6,380 $ 6,517
Issuances 0 0  
Interest accrual 79 323  
Benefit payments (107) (432)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 6,352 6,408  
Effect of changes in discount rate assumptions (148) (221)  
Ending balance 6,204 6,187  
Adjustment due to reserve flooring 0 0  
Net liability for future policy benefits 5,174 5,130  
Less: reinsurance recoverable 2,613 2,591  
Net liability for future policy benefits, after reinsurance recoverable 2,561 2,539  
Discounted expected future gross premiums 1,229 1,247  
Expected future gross premiums 1,666 1,713  
Expected future benefit payments $ 10,390 $ 10,522  
Weighted average interest accretion rate 5.10% 5.00%  
Weighted average discount rate 5.50% 5.70%  
Weighted average duration of liability (in years) 8 years 8 years