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Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer receivables, less allowance	$ 1,215	$ 1,193
Contract assets	30	19
Contract liabilities	675	733
Allowance	42	$ 50
Held for sale | Mass Markets Fiber-to-the Home Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer receivables, less allowance	13
Contract liabilities	$ 33

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