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Divestitures of the Latin American and ILEC Businesses and Planned Divestiture of the EMEA Business - Additional Information (Details) |  |  |  |  |  |  | 12 Months Ended |  |  |
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Oct. 31, 2022 USD ($) | Oct. 03, 2022 USD ($) state | Oct. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) | Jan. 31, 2021 USD ($) | Oct. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 02, 2022 USD ($) | Aug. 01, 2022 USD ($) | Jul. 25, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ (700,000,000) | $ 0 | $ 0 |  |  |
Goodwill |  |  |  |  | $ 0 |  | 12,657,000,000 | 15,986,000,000 | 18,870,000,000 |  |  |
Realized loss on foreign currency translation to gain on sale of business |  |  |  |  |  |  | (112,000,000) | 0 | 0 |  |  |
Depreciation and amortization |  |  |  |  |  |  | 3,239,000,000 | 4,019,000,000 | 4,710,000,000 |  |  |
Goodwill impairment |  |  | $ 0 | $ 0 | $ 0 | $ 2,600,000,000 | 3,271,000,000 | $ 0 | $ 2,642,000,000 |  |  |
Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reclassified of net actuarial loss and prior service credit, net of tax |  | $ 403,000,000 |  |  |  |  |  |  |  |  |  |
Purchaser of ILEC |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase obligation |  | $ 373,000,000 |  |  |  |  |  |  |  |  |  |
Purchase obligation period |  | 3 years |  |  |  |  |  |  |  |  |  |
Purchaser of ILEC |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase obligation |  | $ 67,000,000 |  |  |  |  |  |  |  |  |  |
Purchase obligation period |  | 3 years |  |  |  |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | (660,000,000) |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  | 51,000,000 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Latin American Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  | $ 129,000,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Latin American Business | Level 3 Parent, LLC |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from disposal of business |  |  |  |  |  |  |  |  |  |  |  | $ 2,700,000,000
Disposal Group, Held-for-sale, Not Discontinued Operations | ILEC Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from disposal of business |  | $ 7,500,000,000 |  |  |  |  |  |  |  |  |  |
Long term debt, net of discounts |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | EMEA Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net assets |  |  |  |  |  |  | 1,823,000,000 |  |  |  |  |
Property, plant and equipment, net accumulated depreciation |  |  |  |  |  |  | 1,873,000,000 |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  | 1,033,000,000 |  |  |  |  |
Deferred income tax liabilities |  |  |  |  |  |  | 38,000,000 |  |  |  |  |
Goodwill impairment | $ 43,000,000 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Latin American Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | 597,000,000 |  |  |  |  |
Indemnifications related to the sale of businesses |  |  |  |  |  |  | 86,000,000 |  |  |  |  |
Net assets |  |  |  |  |  |  |  |  |  |  | 1,900,000,000 |
Property, plant and equipment, net accumulated depreciation |  |  |  |  |  |  |  |  |  |  | 1,700,000,000 |
Goodwill |  |  |  |  |  |  |  |  |  |  | 245,000,000 |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  | 140,000,000 |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  | $ 154,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ILEC Business |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ 176,000,000 |  |  |  |  |
Indemnifications related to the sale of businesses |  | 89,000,000 |  |  |  |  |  |  |  |  |  |
Net assets |  | 4,800,000,000 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net accumulated depreciation |  | 3,600,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 2,600,000,000 |  |  |  |  |  |  |  |  |  |
Number of states in which the business is conducted | state |  | 20 |  |  |  |  |  |  |  |  |  |
Consideration after closing adjustments |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Long term debt, net of discounts |  | 1,400,000,000 |  |  |  |  |  |  |  |  |  |
Net proceeds from sales of colocation business and data centers |  | $ 5,600,000,000 |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EMEA Business | Level 3 Parent, LLC |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration from disposal of business |  |  |  |  |  |  |  |  |  | $ 1,800,000,000 |  |

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