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Future Policy Benefits - 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
Present Value of Expected Net Premiums:      
Balance, beginning of period $ 3,145 $ 3,520  
Beginning balance at original discount rate 3,254 3,826  
Effect of changes in cash flow assumptions   (63) $ (353)
Effect of actual variances from expected experience   (28) (57)
Adjusted beginning of period balance   3,163 3,416
Acquisition from business combination 0 0  
Issuances 1,023 1,074  
Interest accrual 68 129  
Net premiums collected (1,166) (1,368)  
Derecognitions (lapses and withdrawals) 1 3  
Foreign currency translation 0 0  
Ending balance at original discount rate 3,089 3,254  
Effect of changes in discount rate assumptions (235) (109)  
Balance, end of period 2,854 3,145  
Present Value of Expected Future Policy Benefits:      
Balance, beginning of period 7,253 6,618  
Beginning balance at original discount rate 7,494 7,243  
Effect of changes in cash flow assumptions   75 (363)
Effect of actual variances from expected experience   (27) (84)
Adjusted beginning of period balance   7,542 6,796
Acquisition of business combination 311 0  
Issuances 1,035 1,077  
Interest accrual 172 261  
Benefit payments (363) (645)  
Derecognitions (lapses and withdrawals) 2 5  
Foreign currency translation 0 0  
Ending balance at original discount rate 8,699 7,494  
Effect of changes in discount rate assumptions (596) (241)  
Effect of foreign currency translation on the effect of changes in discount rate assumptions 0 0  
Balance, end of period 8,103 7,253  
Total future policy benefits 5,249 4,108  
Less: Reinsurance recoverables (49) (45)  
Net liability for future policy benefits, after reinsurance recoverable 5,200 4,063  
Annuity      
Present Value of Expected Net Premiums:      
Balance, beginning of period 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   6 2
Adjusted beginning of period balance   6 2
Acquisition from business combination 0 0  
Issuances 991 984  
Interest accrual 6 8  
Net premiums collected (1,004) (995)  
Derecognitions (lapses and withdrawals) 0 1  
Foreign currency translation 0 0  
Ending balance at original discount rate (1) 0  
Effect of changes in discount rate assumptions 0 0  
Balance, end of period (1) 0  
Present Value of Expected Future Policy Benefits:      
Balance, beginning of period 2,213 1,288  
Beginning balance at original discount rate 2,217 1,368  
Effect of changes in cash flow assumptions   1 (1)
Effect of actual variances from expected experience   6 (25)
Adjusted beginning of period balance   2,224 1,342
Acquisition of business combination 311 0  
Issuances 1,003 988  
Interest accrual 71 73  
Benefit payments (135) (189)  
Derecognitions (lapses and withdrawals) 1 3  
Foreign currency translation 0 0  
Ending balance at original discount rate 3,475 2,217  
Effect of changes in discount rate assumptions (91) (4)  
Effect of foreign currency translation on the effect of changes in discount rate assumptions 0 0  
Balance, end of period 3,384 2,213  
Total future policy benefits 3,385 2,213  
Less: Reinsurance recoverables (3) 0  
Net liability for future policy benefits, after reinsurance recoverable $ 3,382 $ 2,213  
Weighted-average liability duration of future policy benefits (years) 8 years 8 years  
Weighted average interest accretion rate 5.09% 4.94%  
Weighted average current discount rate 5.47% 4.88%  
Life      
Present Value of Expected Net Premiums:      
Balance, beginning of period $ 3,145 $ 3,520  
Beginning balance at original discount rate 3,254 3,826  
Effect of changes in cash flow assumptions   (63) (353)
Effect of actual variances from expected experience   (34) (59)
Adjusted beginning of period balance   3,157 3,414
Acquisition from business combination 0 0  
Issuances 32 90  
Interest accrual 62 121  
Net premiums collected (162) (373)  
Derecognitions (lapses and withdrawals) 1 2  
Foreign currency translation 0 0  
Ending balance at original discount rate 3,090 3,254  
Effect of changes in discount rate assumptions (235) (109)  
Balance, end of period 2,855 3,145  
Present Value of Expected Future Policy Benefits:      
Balance, beginning of period 5,040 5,330  
Beginning balance at original discount rate 5,277 5,875  
Effect of changes in cash flow assumptions   74 (362)
Effect of actual variances from expected experience   (33) (59)
Adjusted beginning of period balance   5,318 $ 5,454
Acquisition of business combination 0 0  
Issuances 32 89  
Interest accrual 101 188  
Benefit payments (228) (456)  
Derecognitions (lapses and withdrawals) 1 2  
Foreign currency translation 0 0  
Ending balance at original discount rate 5,224 5,277  
Effect of changes in discount rate assumptions (505) (237)  
Effect of foreign currency translation on the effect of changes in discount rate assumptions 0 0  
Balance, end of period 4,719 5,040  
Total future policy benefits 1,864 1,895  
Less: Reinsurance recoverables (46) (45)  
Net liability for future policy benefits, after reinsurance recoverable $ 1,818 $ 1,850  
Weighted-average liability duration of future policy benefits (years) 16 years 16 years  
Weighted average interest accretion rate 4.61% 4.60%  
Weighted average current discount rate 5.58% 5.03%