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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 6,996 $ 8,588    
Cash, cash equivalents, restricted cash and restricted cash equivalents 8,802 10,465 $ 8,521 $ 9,196
Restricted Cash, Security Deposits        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents 1,772 1,845    
Restricted Cash, Prepaid Expense and Other Current Assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents $ 34 $ 32