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Equipment Installment Plan Financing Facility (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Long-Term Debt:    
EQUIPMENT INSTALLMENT PLAN FINANCING FACILITY $ 1,072 $ 0
EIP Unpaid Principal Balance 1,600  
Restricted cash $ 47  
EIP Financing Facility    
Long-Term Debt:    
Stated interest rate (percentage) 5.78%  
Maximum borrowing capacity $ 1,250