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Acquisition of Level 3 - Additional Information (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 14 Months Ended
Jan. 22, 2018
USD ($)
Nov. 01, 2017
USD ($)
city
dark_fiber
$ / shares
shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
shares
Oct. 31, 2017
$ / shares
shares
Business Acquisition [Line Items]              
Common stock, shares outstanding (in shares) | shares       1,078,632   1,069,169  
Goodwill       $ 30,778.0   $ 30,475.0  
Assets held for sale, selling price $ 68.0            
Deposits received from assets held for sale       34.0 $ 0.0    
CenturyLink Escrow, LLC | Medium-term notes              
Business Acquisition [Line Items]              
Long-term debt, gross   $ 7,945.0          
CenturyLink Escrow, LLC | Revolving credit facility | New Revolving Credit Facility              
Business Acquisition [Line Items]              
Long-term debt, gross   400.0          
CenturyLink, Inc. | Level 3 Parent, LLC              
Business Acquisition [Line Items]              
Note payable to Level 3 Parent, LLC   $ 1,825.0          
Level 3 Parent, LLC              
Business Acquisition [Line Items]              
Share price (in dollars per share) | $ / shares   $ 26.50          
Stock conversion ratio   1.4286          
RSU conversion ratio   2.8386          
Consideration transferred   $ 19,612.0          
Equity interest issued or issuable (in shares) | shares   517,300          
Share price (in dollars per share) | $ / shares             $ 18.99
Common stock, shares outstanding (in shares) | shares             362,200
Payment for RSU conversion   $ 1.0          
Equity interests issued and issuable   131.0          
Payment to settle claims   58.0          
Long-term debt assumed   $ 10,600.0   10,888.0   10,888.0  
Number of strands of dark fiber divested | dark_fiber   24          
Number of cities connected by dark fiber | city   30          
Goodwill       11,141.0   10,837.0  
Transaction costs and integration-related costs           $ 393.0  
Transaction costs   $ 47.0          
Revenue of acquiree since acquisition date, actual       $ 2,062.0      
Level 3 Parent, LLC | Level 3 Parent, LLC              
Business Acquisition [Line Items]              
Ownership percent by parent   51.00%          
Ownership percent by noncontrolling owners   49.00%          
Scenario, Forecast [Member]              
Business Acquisition [Line Items]              
Proceeds from sale of intangible assets     $ 34.0