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Business Combinations Acquired Assets and Liabilities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Business Acquisition [Line Items]  
Cash and Equivalents $ 1,537
Accounts Receivable and Other Current Assets 1,775
Property, Equipment and other long-term assets 1,941
Medical costs payable (868)
Accounts Payable and other current liabilities (1,669)
Other long-term liabilities (1,283)
Total Net Tangible Liabilities $ 1,433