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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 367 $ 1,429    
Restricted cash included in Other current assets 47 23    
Cash, cash equivalents and restricted cash in the statement of cash flows $ 414 $ 1,452 $ 474 $ 927