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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 $ 156 $ 1,271    
Restricted cash included in Other current assets 43 20    
Cash, cash equivalents and restricted cash in the statement of cash flows $ 199 $ 1,291 $ 291 $ 583