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Significant Accounting Policies - Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 2,156	$ 2,177
Government receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	1,589	1,566
Pharmacy rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	306	276
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total receivables	$ 261	$ 335

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No definition available.

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+ References

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