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Planned Divestiture of the EMEA Business - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Nov. 02, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Depreciation and amortization         $ 2,234 $ 2,443    
Goodwill impairment $ 0 $ 8,800   $ 0 8,793 0    
Loss on disposal group held for sale 22     $ 0 112 $ 0    
Held-for-sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Depreciation and amortization 88       232      
Loss on disposal group held for sale $ 22       $ 112      
Held-for-sale, Not Discontinued Operations | EMEA Business                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Goodwill impairment     $ 43          
Loss on disposal group held for sale             $ 660  
Held-for-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