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Business Combinations Acquired Assets and Liabilities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]  
Cash and cash equivalents $ 715
Accounts receivable and other current assets 735
Property, equipment and other long-term assets 816
Medical costs payable (316)
Accounts payable and other current liabilities (861)
Other long-term liabilities (817)
Total net tangible assets $ 272