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Business Combinations Business Combinations (Tables)
12 Months Ended
Dec. 31, 2020
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Acquired tangible assets (liabilities) at acquisition date were:
(in millions)
Cash and cash equivalents$715 
Accounts receivable and other current assets735 
Property, equipment and other long-term assets816 
Medical costs payable(316)
Accounts payable and other current liabilities(861)
Other long-term liabilities(817)
Total net tangible assets$272