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CenturyLink Merger - Narrative (Details)
$ / shares in Units, $ in Millions
Dec. 31, 2018
USD ($)
Oct. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 01, 2017
USD ($)
metropolitan_area
city
dark_fiber
$ / shares
Oct. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Goodwill $ 11,119   $ 10,837   $ 10,821
Level 3 Parent, LLC | Restricted Stock Units (RSUs)          
Business Acquisition [Line Items]          
Stock conversion ratio       2.8386  
Level 3 Parent, LLC | Level 3 Communications, Inc.          
Business Acquisition [Line Items]          
Cash consideration per share (in dollars per share) | $ / shares       $ 26.50  
Level 3 Parent, LLC | CenturyLink          
Business Acquisition [Line Items]          
Stock conversion ratio       1.4286  
Number of metropolitan areas containing divested assets | metropolitan_area       3  
Number of strands of dark fiber divested | dark_fiber       24  
Number of cities connected by dark fiber | city       30  
Goodwill   $ 11,177 $ 10,837    
Transaction costs       $ 47  
Level 3 Parent, LLC | CenturyLink | Restricted stock awards          
Business Acquisition [Line Items]          
Goodwill       1  
Level 3 Parent, LLC | CenturyLink | Unsecured Debt          
Business Acquisition [Line Items]          
Long-term debt       $ 1,825  
Stated interest rate (as a percent)       3.50%  
Level 3 Communications, Inc. | Level 3 Parent, LLC          
Business Acquisition [Line Items]          
Ownership percentage by parent       51.00%  
Level 3 Communications, Inc. | Level 3 Parent, LLC | Level 3 Shareholders          
Business Acquisition [Line Items]          
Ownership percentage by noncontrolling owners       49.00%