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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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