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Medical Costs Payable Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Medical costs payable, beginning of period $ 24,483 $ 21,872 $ 21,690
Acquisitions 308 88 316
Reported medical costs:      
Current year 211,252 188,631 160,276
Prior years (410) (1,720) (880)
Total reported medical costs 210,842 186,911 159,396
Medical payments:      
Payments for current year (184,049) (165,524) (139,974)
Payments for prior years (22,528) (18,864) (19,556)
Total medical payments (206,577) (184,388) (159,530)
Medical costs payable, end of period $ 29,056 $ 24,483 $ 21,872