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Medical Costs Payable Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]      
Medical costs payable, beginning of period $ 29,056 $ 24,483 $ 21,872
Acquisitions 1 308 88
Reported medical costs:      
Current year 242,734 211,252 188,631
Prior years (840) (410) (1,720)
Total reported medical costs 241,894 210,842 186,911
Medical payments:      
Payments for current year (211,380) (184,049) (165,524)
Payments for prior years (27,176) (22,528) (18,864)
Total medical payments (238,556) (206,577) (184,388)
Medical costs payable, end of period $ 32,395 $ 29,056 $ 24,483