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Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]        
Cash and cash equivalents $ 4,804 $ 4,438 $ 4,431  
Restricted cash and cash equivalents 62   66  
Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows $ 4,866 $ 4,506 $ 4,497 $ 4,223