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Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Acquisition Costs |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning of period balance | $ 210 | $ 182 | $ 203 | $ 182
Costs incurred | 32 | 35 | 72 | 68
Amortization | (32) | (32) | (65) | (65)
Change in contract costs held for sale | 0 |  | 0 |
End of period balance | 210 | 185 | 210 | 185
Fulfillment Costs |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Beginning of period balance | 236 | 189 | 222 | 184
Costs incurred | 58 | 49 | 109 | 85
Amortization | (39) | (34) | (76) | (65)
Change in contract costs held for sale | (14) |  | (14) |
End of period balance | 241 | $ 204 | 241 | $ 204
Fulfillment Costs | Held for sale | Mass Markets Fiber-to-the Home Business |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
End of period balance | $ 14 |  | $ 14 |

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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 -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + 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 -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479483/340-40-50-3 + Details
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