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Revenue Recognition - 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 [Line Items] |  |  |  |
Beginning of period balance | $ 48 | $ 57 | $ 51 | $ 58
Cost Incurred | 6 | 9 | 11 | 19
Amortization | (8) | (10) | (16) | (21)
Change in contract costs held for sale | 0 |  | 0 |
End of period balance | 46 | 56 | 46 | 56
Fulfillment Costs |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Beginning of period balance | 47 | 47 | 46 | 46
Cost Incurred | 12 | 9 | 21 | 19
Amortization | (9) | (9) | (17) | (18)
Change in contract costs held for sale | (6) |  | (6) |
End of period balance | 44 | $ 47 | 44 | $ 47
Fulfillment Costs | Held-for-sale | Lumen Mass Markets fiber-to-the-home business |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
End of period balance | $ 6 |  | $ 6 |

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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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