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Acquisition of Level 3 - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended 36 Months Ended
Nov. 01, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Business Acquisition [Line Items]              
Goodwill   $ 21,534,000,000 $ 28,031,000,000 $ 30,475,000,000 $ 21,534,000,000    
Level 3 Parent, LLC              
Business Acquisition [Line Items]              
Price per share of stock in business acquisition (in dollars per share) $ 26.50            
Stock conversion ratio 1.4286            
Business acquisition total consideration $ 19,600,000,000            
Equity interests issued or issuable (in shares) 517.3            
Price of share of common stock (in dollars per share)             $ 18.99
Shares outstanding (in shares)             362.1
Consideration transferred, dissenting shares $ 60,000,000            
Long-term debt 10,600,000,000     10,888,000,000   $ 10,888,000,000  
Note payable - related party 1,825,000,000            
Goodwill       10,837,000,000   $ 11,177,000,000  
Acquisition-related expenses   234,000,000 393,000,000 271,000,000 950,000,000    
Transaction-related expenses   $ 0 $ 2,000,000 $ 174,000,000 $ 0    
Level 3 Parent, LLC | Medium-term Notes | Term Loan              
Business Acquisition [Line Items]              
Debt instrument, face amount 7,945,000,000            
Level 3 Parent, LLC | Revolving Credit Facility | 2017 Revolving Credit Facility              
Business Acquisition [Line Items]              
Debt instrument, face amount $ 400,000,000            
Level 3 Parent, LLC | Restricted Stock              
Business Acquisition [Line Items]              
Price per share of stock in business acquisition (in dollars per share) $ 26.50            
Stock conversion ratio 1.4286            
Level 3 Parent, LLC | Restricted Stock Units (RSUs)              
Business Acquisition [Line Items]              
Stock conversion ratio 2.8386            
Business acquisition total consideration $ 136,000,000            
Consideration transferred, settlement of shares 1,000,000            
Level 3 Parent, LLC | Level 3 Communications, Inc.              
Business Acquisition [Line Items]              
Transaction-related expenses $ 47,000,000            
Level 3 Parent, LLC | Level 3 Communications, Inc.              
Business Acquisition [Line Items]              
Ownership percentage by parent 51.00%            
Level 3 Parent, LLC | Level 3 Communications, Inc. | Level 3 Shareholders              
Business Acquisition [Line Items]              
Ownership percentage by noncontrolling owners 49.00%