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Unpaid Claims and Claims Expense Short Duration Contracts (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Liability for Claims and Claims Adjustment Expense $ 2,870 $ 2,753 $ 2,693 $ 2,730
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (58) (75) (53) (80)
Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable 2,812 2,678 $ 2,640 $ 2,650
Current Year Claims and Claims Adjustment Expense 505 399    
Prior Year Claims and Claims Adjustment Expense (13) (28)    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 492 371    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (23) (19)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (307) (290)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (330) (309)    
Interest On Liability For Policy And Contract Claims 9 10    
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) 1 (44)    
Liability for Unpaid Claims and Claims Adjustment Expense Other $ (10) $ (34)