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Equipment Installment Plan Financing Facility (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Long-term Debt:    
EQUIPMENT INSTALLMENT PLAN FINANCING FACILITY $ 998 $ 0
EIP Unpaid Principal Balance 1,500  
Restricted cash $ 29  
EIP Financing Facility    
Long-term Debt:    
Stated interest rate (percentage) 6.41%  
EIP Financing Facility Borrowing Capacity $ 1,250