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Other Insurance Liabilities and Separate Accounts - Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Present value of expected future policy benefits        
Effect of changes in discount rate assumptions $ (23)      
Large Case Pensions        
Present value of expected future policy benefits        
Liability for future policy benefits, beginning of period - current discount rate 2,253 $ 3,034    
Beginning liability for future policy benefits at original (locked-in) discount rate 2,425 2,650    
Effect of changes in cash flow assumptions   0 $ 0  
Effect of actual variances from expected experience   (3) (44)  
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate   2,422 2,606  
Issuances 8 4    
Interest accrual (using locked-in discount rate) 97 106    
Benefit payments (actual) (276) (291)    
Ending liability for future policy benefits at original (locked-in) discount rate 2,251 2,425    
Effect of changes in discount rate assumptions (112) (172)    
Liability for future policy benefits, end of period - current discount rate 2,139 2,253    
Net liability for future policy benefits 2,139 2,253    
Less: Reinsurance recoverable 0 0   $ 0
Net liability for future policy benefits, net of reinsurance recoverable 2,139 2,253   3,647
Long-Term Care        
Present value of expected net premiums        
Liability for future policy benefits, beginning of period - current discount rate 300 389    
Beginning liability for future policy benefits at original (locked-in) discount rate 302 323    
Effect of changes in cash flow assumptions   0 (15)  
Effect of actual variances from expected experience   10 18  
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate   312 326  
Interest accrual (using locked-in discount rate) 15 16    
Net premiums (actual) (39) (40)    
Ending liability for future policy benefits at original (locked-in) discount rate 288 302    
Effect of changes in discount rate assumptions 5 (2)    
Liability for future policy benefits, end of period - current discount rate 293 300    
Present value of expected future policy benefits        
Liability for future policy benefits, beginning of period - current discount rate 1,566 1,991    
Beginning liability for future policy benefits at original (locked-in) discount rate 1,613 1,480    
Effect of changes in cash flow assumptions   0 99  
Effect of actual variances from expected experience   8 18  
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate   1,621 $ 1,597  
Issuances 0 0    
Interest accrual (using locked-in discount rate) 82 80    
Benefit payments (actual) (71) (64)    
Ending liability for future policy benefits at original (locked-in) discount rate 1,632 1,613    
Effect of changes in discount rate assumptions 8 (47)    
Liability for future policy benefits, end of period - current discount rate 1,640 1,566    
Net liability for future policy benefits 1,347 1,266    
Less: Reinsurance recoverable 0 0   0
Net liability for future policy benefits, net of reinsurance recoverable $ 1,347 $ 1,266   $ 1,695