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Significant Accounting Policies - Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables $ 3,350 $ 3,104
Government receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables 2,270 2,354
Pharmacy rebate receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables 369 330
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total receivables $ 711 $ 420