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Business Combinations - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 29, 2019
Jan. 29, 2019
May 18, 2018
Apr. 29, 2018
Jan. 22, 2018
Jan. 01, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Jun. 06, 2018
Dec. 31, 2017
Business Acquisition [Line Items]                              
Payments of consent fees               $ 0   $ 0 $ 38,000,000 $ 0      
Payments for third party bank fees               3,314,000,000   $ 3,098,000,000 9,663,000,000 $ 8,968,000,000      
Costs recognized associated with merger transaction               0              
Goodwill               1,901,000,000     1,901,000,000       $ 1,683,000,000
Sprint                              
Business Acquisition [Line Items]                              
Exchange ratio       0.10256                      
Exchange ratio (in shares)       9.75                      
Payments of consent fees                 $ 31,000,000            
Required reimbursement by acquiree upon termination, percentage     33.00%                        
Upfront payments to third party note holders by acquiree                 241,000,000            
Required reimbursement by acquirer upon termination, percentage     67.00%                        
Required reimbursement by acquirer upon termination     $ 161,000,000                        
Costs recognized associated with merger transaction               53,000,000     94,000,000        
Required payment resulting from failure to satisfy closing condition of business combination agreement (up to)       $ 600,000,000                      
Sprint | Senior Notes                              
Business Acquisition [Line Items]                              
Payments of consent fees     $ 14,000,000           17,000,000            
Payments for third party bank fees                 6,000,000            
Sprint | Deutsche Telekom AG                              
Business Acquisition [Line Items]                              
Payments of consent fees                 $ 7,000,000            
Sprint | Scenario, Forecast | Senior Notes                              
Business Acquisition [Line Items]                              
Payments of consent fees             $ 54,000,000                
Sprint | Scenario, Forecast | Deutsche Telekom AG                              
Business Acquisition [Line Items]                              
Payments of consent fees             $ 20,000,000                
Sprint | Secured and Unsecured Debt Financing                              
Business Acquisition [Line Items]                              
Financing commitment, amount       38,000,000,000       $ 30,000,000,000     $ 30,000,000,000        
Reduction of initial aggregate commitment under Commitment Letter                           $ 8,000,000,000  
Sprint | Secured and Unsecured Debt Financing | Scenario One | Scenario, Forecast                              
Business Acquisition [Line Items]                              
Payments of consent fees   $ 275,000,000                          
Sprint | Secured and Unsecured Debt Financing | Scenario Two | Scenario, Forecast                              
Business Acquisition [Line Items]                              
Payments of consent fees $ 340,000,000                            
Sprint | Secured Term Loan Facility                              
Business Acquisition [Line Items]                              
Financing commitment, amount       $ 7,000,000,000                      
Sprint | Subsequent Event                              
Business Acquisition [Line Items]                              
Fully-diluted shares of combined company held by public stockholders (percent)                         31.00%    
Sprint | Deutsche Telekom AG | Subsequent Event                              
Business Acquisition [Line Items]                              
Fully-diluted shares expected to be held immediately following merger (percent)                         41.70%    
Sprint | SoftBank | Subsequent Event                              
Business Acquisition [Line Items]                              
Fully-diluted shares expected to be held immediately following merger (percent)                         27.30%    
Layer3 TV                              
Business Acquisition [Line Items]                              
Cash consideration         $ 318,000,000                    
Payment included in consideration after closing of transaction         5,000,000                    
Grant-date fair value of cash-based and share-based incentive compensation awards         37,000,000                    
Liability recognized         21,000,000                    
Indemnification assets         12,000,000                    
Goodwill         218,000,000                    
Intangible assets         100,000,000                    
Layer3 TV | Developed Technology                              
Business Acquisition [Line Items]                              
Intangible assets         $ 100,000,000                    
Estimated useful life (in years)         5 years                    
Iowa Wireless                              
Business Acquisition [Line Items]                              
Cash consideration           $ 25,000,000                  
Purchase price of unconsolidated subsidiary           25,000,000                  
Fair value of equity interest held           56,000,000                  
Gain on remeasurement of equity interest           15,000,000                  
Bargain purchase gain           $ 25,000,000                  
Unconsolidated subsidiary ownership percentage           54.00%