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Accounts Receivable, Net - Amounts (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Receivables [Abstract]    
Noninsurance customer receivables $ 13,357  
Pharmaceutical manufacturer receivables 11,393  
Insurance customer receivables 1,488  
Other receivables 691  
Accounts receivable, net $ 26,929 $ 24,227