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Other Insurance Liabilities and Separate Accounts - Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Present value of expected future policy benefits        
Effect of changes in discount rate assumptions $ (24) $ (22) $ (23)  
Large Case Pensions        
Present value of expected future policy benefits        
Liability for future policy benefits, beginning of the period - current discount rate 2,139 2,253    
Beginning liability for future policy benefits at original (locked-in) discount rate 2,251 2,425    
Effect of changes in cash flow assumptions     0 $ 0
Effect of actual variances from expected experience     (15) 0
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     2,236 2,425
Issuances 26 7    
Interest accrual (using locked-in discount rate) 46 50    
Benefit payments (actual) (129) (143)    
Ending liability for future policy benefits at original (locked-in) discount rate 2,179 2,339    
Effect of changes in discount rate assumptions (176) (154)    
Liability for future policy benefits, end of the period - current discount rate 2,003 2,185    
Net liability for future policy benefits 2,003 2,185    
Less: Reinsurance recoverable 0 0    
Net liability for future policy benefits, net of reinsurance recoverable 2,003 2,185    
Long-Term Care        
Present value of expected net premiums        
Liability for future policy benefits, beginning of the period - current discount rate 293 300    
Beginning liability for future policy benefits at original (locked-in) discount rate 288 302    
Effect of changes in cash flow assumptions     0 0
Effect of actual variances from expected experience     9 5
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     297 307
Interest accrual (using locked-in discount rate) 8 8    
Net premiums (actual) (20) (20)    
Ending liability for future policy benefits at original (locked-in) discount rate 285 295    
Effect of changes in discount rate assumptions (4) (1)    
Liability for future policy benefits, end of the period - current discount rate 281 294    
Present value of expected future policy benefits        
Liability for future policy benefits, beginning of the period - current discount rate 1,640 1,566    
Beginning liability for future policy benefits at original (locked-in) discount rate 1,632 1,613    
Effect of changes in cash flow assumptions     0 0
Effect of actual variances from expected experience     3 0
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     $ 1,635 $ 1,613
Issuances 0 0    
Interest accrual (using locked-in discount rate) 41 40    
Benefit payments (actual) (36) (35)    
Ending liability for future policy benefits at original (locked-in) discount rate 1,640 1,618    
Effect of changes in discount rate assumptions (77) (22)    
Liability for future policy benefits, end of the period - current discount rate 1,563 1,596    
Net liability for future policy benefits 1,282 1,302    
Less: Reinsurance recoverable 0 0    
Net liability for future policy benefits, net of reinsurance recoverable $ 1,282 $ 1,302