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Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Accounting Policies [Abstract]        
Cash and cash equivalents $ 4,910 $ 4,006 $ 4,312  
Restricted cash and cash equivalents 47   66  
Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows $ 4,957 $ 4,048 $ 4,378 $ 4,506