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Significant Accounting Policies - Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Statutory Accounting Practices [Line Items]    
Total receivables $ 2,177 $ 1,672
Government receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 1,566 969
Pharmacy rebate receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 276 178
Health insurer fee reimbursement receivables    
Statutory Accounting Practices [Line Items]    
Total receivables 0 104
Other    
Statutory Accounting Practices [Line Items]    
Total receivables 335 255
Magellan Complete Care acquisition opening balance    
Statutory Accounting Practices [Line Items]    
Total receivables $ 0 $ 166