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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Restricted Cash [Abstract]        
Cash and cash equivalents $ 765 $ 607    
Restricted cash included in prepaid expenses and other current assets 55 50    
Restricted cash included in other non-current assets 1 6    
Total restricted cash 56 56    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 821 $ 663 $ 348 $ 659