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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 2,261 $ 1,173    
Restricted cash included in prepaid expenses and other current assets 65 64    
Restricted cash included in other non-current assets 1 1    
Total restricted cash 66 65    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 2,327 $ 1,238 $ 688 $ 663