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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, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Present value of expected future policy benefits        
Effect of changes in discount rate assumptions $ (30) $ (24) $ (1) $ (23)
Large Case Pensions        
Present value of expected future policy benefits        
Liability for future policy benefits, beginning of the period - current discount rate 1,917 2,139    
Beginning liability for future policy benefits at original (locked-in) discount rate 2,090 2,251    
Effect of changes in cash flow assumptions     0 0
Effect of actual variances from expected experience     (3) (15)
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     2,087 2,236
Issuances 10 26    
Interest accrual (using locked-in discount rate) 43 46    
Benefit payments (actual) (123) (129)    
Ending liability for future policy benefits at original (locked-in) discount rate 2,017 2,179    
Effect of changes in discount rate assumptions (139) (176)    
Liability for future policy benefits, end of the period - current discount rate 1,878 2,003    
Net liability for future policy benefits 1,878 2,003    
Less: Reinsurance recoverable 0 0    
Net liability for future policy benefits, net of reinsurance recoverable 1,878 2,003    
Long-Term Care        
Present value of expected net premiums        
Liability for future policy benefits, beginning of the period - current discount rate 275 293    
Beginning liability for future policy benefits at original (locked-in) discount rate 280 288    
Effect of changes in cash flow assumptions     0 0
Effect of actual variances from expected experience     2 9
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     282 297
Interest accrual (using locked-in discount rate) 7 8    
Net premiums (actual) (19) (20)    
Ending liability for future policy benefits at original (locked-in) discount rate 270 285    
Effect of changes in discount rate assumptions 0 (4)    
Liability for future policy benefits, end of the period - current discount rate 270 281    
Present value of expected future policy benefits        
Liability for future policy benefits, beginning of the period - current discount rate 1,552 1,640    
Beginning liability for future policy benefits at original (locked-in) discount rate 1,647 1,632    
Effect of changes in cash flow assumptions     0 0
Effect of actual variances from expected experience     4 3
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     $ 1,651 $ 1,635
Issuances 0 0    
Interest accrual (using locked-in discount rate) 41 41    
Benefit payments (actual) (39) (36)    
Ending liability for future policy benefits at original (locked-in) discount rate 1,653 1,640    
Effect of changes in discount rate assumptions (73) (77)    
Liability for future policy benefits, end of the period - current discount rate 1,580 1,563    
Net liability for future policy benefits 1,310 1,282    
Less: Reinsurance recoverable 0 0    
Net liability for future policy benefits, net of reinsurance recoverable $ 1,310 $ 1,282