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Significant Accounting Policies - Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Statutory Accounting Practices [Line Items]    
Total receivables $ 2,302 $ 2,177
Government receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 1,702 1,566
Pharmacy rebate receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 291 276
Other    
Statutory Accounting Practices [Line Items]    
Total receivables $ 309 $ 335