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Revenue Recognition - Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Capitalized Contract Cost [Line Items]
Customer receivables	$ 1,407	$ 1,493
Contract assets	56	73
Contract liabilities	714	680
Accounts receivable, gross	1,500	1,600
Allowance for doubtful accounts receivable	84	102
Disposal Group, Held-for-sale, Not Discontinued Operations
Capitalized Contract Cost [Line Items]
Customer receivables		288
Contract assets		9
Contract liabilities		$ 161
Disposal Group, Held-for-sale, Not Discontinued Operations | ILEC Business
Capitalized Contract Cost [Line Items]
Customer receivables	175
Contract assets	7
Contract liabilities	$ 76

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