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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
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Balance $ 9,137 $ 9,378  
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance 1,953 2,027  
Beginning balance at original discount rate 1,950 2,065  
Effect of changes in cash flow assumptions   0 $ (19)
Effect of actual variances from expected experience   (22) (23)
Adjusted beginning of year balance   1,928 2,023
Issuances 139 244  
Interest accrual 49 101  
Net premiums collected (220) (418)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,896 1,950  
Effect of changes in discount rate assumptions (52) 3  
Ending balance 1,844 1,953  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 9,711 9,519  
Beginning balance at original discount rate 9,641 9,706  
Effect of changes in cash flow assumptions   0 (34)
Effect of actual variances from expected experience   (41) (35)
Adjusted beginning of year balance   9,600 9,637
Issuances 139 244  
Interest accrual 244 489  
Benefit payments (381) (729)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 9,602 9,641  
Effect of changes in discount rate assumptions (296) 70  
Ending balance 9,306 9,711  
Adjustment due to reserve flooring 6 5  
Reserve for future policy benefits 7,468 7,763  
Less: reinsurance recoverable 3,864 4,080  
Net liability for future policy benefits, after reinsurance recoverable 3,604 3,683  
Discounted expected future gross premiums 3,768 3,993  
Expected future gross premiums 5,818 5,993  
Expected future benefit payments 15,635 15,810  
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 105 177  
Interest accrual 0 1  
Net premiums collected (105) (178)  
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 1,164 1,065  
Beginning balance at original discount rate 1,222 1,155  
Effect of changes in cash flow assumptions   0 0
Effect of actual variances from expected experience   (5) (10)
Adjusted beginning of year balance   1,217 1,145
Issuances 105 177  
Interest accrual 28 50  
Benefit payments (78) (150)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,272 1,222  
Effect of changes in discount rate assumptions (91) (58)  
Ending balance 1,181 1,164  
Adjustment due to reserve flooring 0 0  
Reserve for future policy benefits 1,181 1,164  
Less: reinsurance recoverable 813 880  
Net liability for future policy benefits, after reinsurance recoverable 368 284  
Discounted expected future gross premiums 0 0  
Expected future gross premiums 0 0  
Expected future benefit payments $ 1,817 $ 1,726  
Weighted average interest accretion rate 4.40% 4.20%  
Weighted average discount rate 5.40% 4.90%  
Weighted average duration of liability (in years) 6 years 7 years  
Term and Whole Life Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 703 $ 686  
Beginning balance at original discount rate 708 708  
Effect of changes in cash flow assumptions   0 (19)
Effect of actual variances from expected experience   0 (2)
Adjusted beginning of year balance   708 687
Issuances 30 55  
Interest accrual 18 36  
Net premiums collected (36) (70)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 720 708  
Effect of changes in discount rate assumptions (30) (5)  
Ending balance 690 703  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 1,325 1,319  
Beginning balance at original discount rate 1,291 1,313  
Effect of changes in cash flow assumptions   0 (18)
Effect of actual variances from expected experience   1 (1)
Adjusted beginning of year balance   1,292 1,294
Issuances 30 56  
Interest accrual 36 73  
Benefit payments (69) (132)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,289 1,291  
Effect of changes in discount rate assumptions (16) 34  
Ending balance 1,273 1,325  
Adjustment due to reserve flooring 6 5  
Reserve for future policy benefits 589 627  
Less: reinsurance recoverable 416 440  
Net liability for future policy benefits, after reinsurance recoverable 173 187  
Discounted expected future gross premiums 1,674 1,764  
Expected future gross premiums 2,889 2,938  
Expected future benefit payments $ 2,163 $ 2,166  
Weighted average interest accretion rate 6.20% 6.20%  
Weighted average discount rate 5.60% 5.10%  
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 $ 104 $ 134  
Beginning balance at original discount rate 105 137  
Effect of changes in cash flow assumptions   0 (19)
Effect of actual variances from expected experience   (11) (18)
Adjusted beginning of year balance   94 100
Issuances 4 12  
Interest accrual 3 5  
Net premiums collected (5) (12)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 96 105  
Effect of changes in discount rate assumptions (5) (1)  
Ending balance 91 104  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 661 696  
Beginning balance at original discount rate 621 669  
Effect of changes in cash flow assumptions   0 (25)
Effect of actual variances from expected experience   (18) (29)
Adjusted beginning of year balance   603 615
Issuances 4 11  
Interest accrual 18 37  
Benefit payments (21) (42)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 604 621  
Effect of changes in discount rate assumptions 14 40  
Ending balance 618 661  
Adjustment due to reserve flooring 0 0  
Reserve for future policy benefits 527 557  
Less: reinsurance recoverable 21 22  
Net liability for future policy benefits, after reinsurance recoverable 506 535  
Discounted expected future gross premiums 857 904  
Expected future gross premiums 1,233 1,269  
Expected future benefit payments $ 1,035 $ 1,068  
Weighted average interest accretion rate 6.20% 6.10%  
Weighted average discount rate 5.60% 5.10%  
Weighted average duration of liability (in years) 8 years 8 years  
Long Term Care Insurance      
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]      
Beginning balance $ 1,146 $ 1,207  
Beginning balance at original discount rate 1,137 1,220  
Effect of changes in cash flow assumptions   0 19
Effect of actual variances from expected experience   (11) (3)
Adjusted beginning of year balance   1,126 1,236
Issuances 0 0  
Interest accrual 28 59  
Net premiums collected (74) (158)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 1,080 1,137  
Effect of changes in discount rate assumptions (17) 9  
Ending balance 1,063 1,146  
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance 6,561 6,439  
Beginning balance at original discount rate 6,507 6,569  
Effect of changes in cash flow assumptions   0 9
Effect of actual variances from expected experience   (19) 5
Adjusted beginning of year balance   6,488 $ 6,583
Issuances 0 0  
Interest accrual 162 329  
Benefit payments (213) (405)  
Derecognition (lapses) 0 0  
Ending balance at original discount rate 6,437 6,507  
Effect of changes in discount rate assumptions (203) 54  
Ending balance 6,234 6,561  
Adjustment due to reserve flooring 0 0  
Reserve for future policy benefits 5,171 5,415  
Less: reinsurance recoverable 2,614 2,738  
Net liability for future policy benefits, after reinsurance recoverable 2,557 2,677  
Discounted expected future gross premiums 1,237 1,325  
Expected future gross premiums 1,696 1,786  
Expected future benefit payments $ 10,620 $ 10,850  
Weighted average interest accretion rate 5.10% 5.00%  
Weighted average discount rate 5.60% 5.10%  
Weighted average duration of liability (in years) 8 years 8 years