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Significant Accounting Policies - Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Statutory Accounting Practices [Line Items]    
Total receivables $ 3,104 $ 2,302
Government receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 2,354 1,702
Pharmacy rebate receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 330 291
Other    
Statutory Accounting Practices [Line Items]    
Total receivables $ 420 $ 309