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Basis of Presentation - Restricted Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 834 $ 921    
Restricted cash included in Other current assets 7 6    
Cash, cash equivalents and restricted cash in the statement of cash flows $ 841 $ 927 $ 877 $ 622