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Recently Completed Divestitures of the Latin American and ILEC Businesses - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Oct. 03, 2022
USD ($)
States
Aug. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain (loss) on disposal $ 593 $ 0 $ 593 $ 0      
Goodwill 15,918   15,918       $ 15,986
Depreciation and amortization     2,443 3,142      
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 593   593        
Indemnifications related to the sale of the Latin American business 86   86        
Net assets           $ 1,900  
Property, plant and equipment, net accumulated depreciation           1,700  
Goodwill           245  
Accumulated depreciation           140  
Deferred income tax liabilities           154  
Disposal Group Disposed of by 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  
Disposal Group Disposed of by Sale, not Discontinued Operations | ILEC Business | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash consideration from disposal of business         $ 7,500    
Number of states in which the business is conducted | States         20    
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     0        
Depreciation and amortization 114 $ 81 350 $ 81      
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]              
Net assets             2,200
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]              
Net assets 6,675   6,675       6,575
Property, plant and equipment, net accumulated depreciation 3,651   3,651       3,491
Accumulated depreciation $ 8,170   $ 8,170       $ 8,303