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Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Acquisition Costs |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Balance at beginning of period | $ 210 | $ 185 | $ 203 | $ 182
Costs incurred | 34 | 36 | 106 | 104
Amortization | (30) | (32) | (95) | (97)
Change in contract costs held for sale | 0 |  | 0 |
Balance at End of period | 214 | 189 | 214 | 189
Fulfillment Costs |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Balance at beginning of period | 241 | 204 | 222 | 184
Costs incurred | 57 | 41 | 166 | 126
Amortization | (41) | (36) | (117) | (101)
Change in contract costs held for sale | (3) |  | (17) |
Balance at End of period | 254 | $ 209 | 254 | $ 209
Fulfillment Costs | Held for sale | Mass Markets Fiber-to-the Home Business |  |  |  |
Capitalized Contract Cost [Roll Forward] |  |  |  |
Balance at beginning of period | 14 |  |  |
Balance at End of period | $ 17 |  | $ 17 |

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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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