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Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Accounting Policies [Abstract]        
Cash and cash equivalents $ 5,056 $ 4,096    
Restricted cash and cash equivalents 1,436 1,755    
Total cash, cash equivalents and restricted cash and cash equivalents in the consolidated statements of cash flows $ 6,492 $ 5,851 $ 6,366 $ 5,805