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Other Insurance Liabilities and Separate Accounts - Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Present value of expected future policy benefits        
Effect of changes in discount rate assumptions $ (24) $ (19) $ (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     (4) (20)
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     2,086 2,231
Issuances 10 26    
Interest accrual (using locked-in discount rate) 64 69    
Benefit payments (actual) (183) (192)    
Ending liability for future policy benefits at original (locked-in) discount rate 1,977 2,134    
Effect of changes in discount rate assumptions (115) (90)    
Liability for future policy benefits, end of the period - current discount rate 1,862 2,044    
Net liability for future policy benefits 1,862 2,044    
Less: Reinsurance recoverable 0 0    
Net liability for future policy benefits, net of reinsurance recoverable 1,862 2,044    
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     3 12
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     283 300
Interest accrual (using locked-in discount rate) 10 11    
Net premiums (actual) (28) (29)    
Ending liability for future policy benefits at original (locked-in) discount rate 265 282    
Effect of changes in discount rate assumptions 2 6    
Liability for future policy benefits, end of the period - current discount rate 267 288    
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     2 5
Adjusted beginning liability for future policy benefits - original (locked-in) discount rate     $ 1,649 $ 1,637
Issuances 0 0    
Interest accrual (using locked-in discount rate) 62 61    
Benefit payments (actual) (58) (55)    
Ending liability for future policy benefits at original (locked-in) discount rate 1,653 1,643    
Effect of changes in discount rate assumptions (46) 12    
Liability for future policy benefits, end of the period - current discount rate 1,607 1,655    
Net liability for future policy benefits 1,340 1,367    
Less: Reinsurance recoverable 0 0    
Net liability for future policy benefits, net of reinsurance recoverable $ 1,340 $ 1,367