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Significant Accounting Policies - Amounts Due To Government Agencies (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Medicaid program:    
Minimum MLR, corridors, and profit sharing $ 1,304 $ 1,145
Other premium adjustments 824 482
Medicare program:    
Minimum MLR, corridors, and profit sharing 64 84
Risk adjustment and Part D risk sharing 59 76
Other premium adjustments 28 27
Marketplace program:    
Risk adjustment 163 230
Minimum MLR 2 2
Other premium adjustments 32 33
Total amounts due government agencies $ 2,476 $ 2,079