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Affordable Care Act (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Affordable Care Act [Abstract]      
Risk adjustment receivable   $ 838 $ 522
Risk adjustment payable   (780) (536)
Minimum medical loss ratio   (103) (196)
Cost sharing reduction receivable     69
Cost sharing reduction payable   (99) $ (42)
Risk adjustment, net receivable increase $ 403    
Risk adjustment pre-tax benefit   $ 368