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Unpaid Claims and Claims Expense Short Duration Contracts (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Liability for Claims and Claims Adjustment Expense $ 2,654 $ 2,366 $ 2,480 $ 2,110
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (71) (63) (57) (81)
Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable 2,583 2,303 $ 2,423 $ 2,029
Current Year Claims and Claims Adjustment Expense 1,268 1,419    
Prior Year Claims and Claims Adjustment Expense (89) (100)    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 1,179 1,319    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (278) (250)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years (721) (688)    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (999) (938)    
Interest On Liability For Policy And Contract Claims 25 21    
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) (45) (128)    
Liability for Unpaid Claims and Claims Adjustment Expense Other $ (20) $ (107)