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Basis of Presentation, Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Basis of Presentation [Abstract]        
Cash and cash equivalents $ 873 $ 619    
Restricted cash included in Other current assets 4 3    
Cash, cash equivalents and restricted cash in the statement of cash flows $ 877 $ 622 $ 795 $ 904