v3.26.1
Equipment Installment Plan Financing Facility (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Long-term Debt:        
EQUIPMENT INSTALLMENT PLAN FINANCING FACILITY $ 1,596 $ 1,447    
EIP Unpaid Principal Balance 2,200 2,200    
Restricted cash $ 105 $ 121 $ 70 $ 47
EIP Financing Facility        
Long-term Debt:        
Stated interest rate (percentage) 4.85% 5.14%    
EIP Financing Facility Borrowing Capacity $ 2,000