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Basis of Presentation - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 421 $ 465    
Restricted cash included in Other current assets 13 9    
Cash, cash equivalents and restricted cash in the statement of cash flows $ 434 $ 474 $ 966 $ 927