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Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Acquisition Costs |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning of period balance | $ 208 | $ 271 | $ 222 | $ 289
Costs incurred | 45 | 43 | 129 | 132
Amortization | (49) | (51) | (150) | (158)
Change in contract costs held for sale | 3 | (35) | 6 | (35)
End of period balance | 207 | 228 | 207 | 228
Acquisition Costs | Held-for-sale |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning of period balance | 31 |  | 34 |
End of period balance |  | 35 |  | 35
Acquisition Costs | Held-for-sale | ILEC Business |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
End of period balance | 28 |  | 28 |
Fulfillment Costs |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning of period balance | 188 | 217 | 186 | 216
Costs incurred | 38 | 37 | 119 | 112
Amortization | (35) | (37) | (113) | (111)
Change in contract costs held for sale | (2) | (31) | (3) | (31)
End of period balance | 189 | 186 | 189 | 186
Fulfillment Costs | Held-for-sale |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning of period balance | 33 |  | 32 |
End of period balance |  | $ 31 |  | $ 31
Fulfillment Costs | Held-for-sale | ILEC Business |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
End of period balance | $ 35 |  | $ 35 |

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- Definition Capitalized Contract Cost, Incurred + References No definition available. + Details
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
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