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Revenues - Other Balance Sheet Accounts (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]    
Equipment Installment Plan Receivables, Current $ 967 $ 673
Equipment Installment Plan Receivables, Noncurrent 980 687
Contract acquisition and fulfillment costs 701 616
Customer prepayments and upfront deferred installation fees $ 456 $ 509