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Equipment Installment Plan Financing Facility (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Long-term Debt:    
EQUIPMENT INSTALLMENT PLAN FINANCING FACILITY $ 1,194 $ 1,072
EIP Unpaid Principal Balance 1,700 1,600
Restricted cash $ 70 $ 47
EIP Financing Facility    
Long-term Debt:    
Stated interest rate (percentage) 5.50% 5.78%
EIP Financing Facility Borrowing Capacity $ 1,250