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Acquisitions and Divestitures (Schedule of Balance Sheet Items Classified as Held for Sale) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Acquisitions and Divestitures [Abstract]    
Other current assets $ 23 $ 21
Other assets, net 213 154
Accrued liabilities $ 28 $ 44