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Acquisition of Level 3 - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 23 Months Ended
Nov. 01, 2017
USD ($)
city
dark_fiber
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]          
Goodwill   $ 30,770 $ 30,770 $ 30,770 $ 30,475
Level 3 Parent, LLC          
Business Acquisition [Line Items]          
Consideration transferred $ 19,600        
Number of strands of dark fiber divested | dark_fiber 24        
Number of cities connected by dark fiber | city 30        
Goodwill   11,190 11,190 11,190 $ 10,837
Transaction costs and integration-related costs       $ 600  
Transaction costs $ 47        
Revenue of acquiree since acquisition date, actual   $ 1,984 $ 6,071