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Equipment Installment Plan Financing Facility (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Long-term Debt:      
EQUIPMENT INSTALLMENT PLAN FINANCING FACILITY $ 1,365 $ 1,072  
EIP Unpaid Principal Balance 2,000 1,600  
Restricted cash $ 57 $ 47 $ 29
EIP Financing Facility      
Long-term Debt:      
Stated interest rate (percentage) 5.44% 5.78%  
EIP Financing Facility Borrowing Capacity $ 1,600