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Basis of Presentation - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 231 $ 1,271    
Restricted cash included in Other current assets 32 20    
Cash, cash equivalents and restricted cash in the statement of cash flows $ 263 $ 1,291 $ 948 $ 291