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Other Financial Information - Other Current Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Prepaid Expenses and Other Current Assets [Abstract] |  |
Prepaid expenses | $ 319 | $ 295
Income tax receivable | 0 | 22
Materials, supplies and inventory | 236 | 96
Contract assets | 20 | 45
Note receivable | 0 | 56
Receivable for sale of land | 0 | 56
Other | 5 | 11
Total other current assets | 803 | 829
Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Other current assets reclassified as held for sale | 59 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Latin American Business and ILEC Business |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Other current assets reclassified as held for sale |  | 126
Acquisition Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | 123 | 142
Fulfillment Costs |  |
Prepaid Expenses and Other Current Assets [Abstract] |  |
Contract costs | $ 100 | $ 106

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