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Future Policy Benefit Reserves - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Insurance [Abstract]        
Liability for unpaid claims and claims adjustment expense, long term care policies, period increase (decrease) $ 15 $ 8    
Liability for future policy benefit, expected future gross premium, discounted, before reinsurance     $ 3,573 $ 3,824
Liability for future policy benefit, weighted-average duration     11 years 11 years
Liability future policy benefit, losses recognized in current period     $ 159 $ 164
Liability future policy benefit, losses recognized in prior period     $ 29 $ 42