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Unpaid Claims and Claims Expense Short Duration Contracts (Rollforward Of Claims) (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Liability for Claims and Claims Adjustment Expense $ 3,032 $ 2,875 $ 2,693 $ 2,730
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (61) (62) (53) (80)
Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable 2,971 2,813 $ 2,640 $ 2,650
Current Year Claims and Claims Adjustment Expense 1,521 1,161    
Prior Year Claims and Claims Adjustment Expense 55 83    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 1,576 1,078    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (356) (240)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (991) (700)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (1,347) (940)    
Interest On Liability For Policy And Contract Claims 26 29    
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) 76 (4)    
Liability for Unpaid Claims and Claims Adjustment Expense Other $ 102 $ 25