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Acquisitions and Divestitures - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 13, 2017
Feb. 28, 2018
Jan. 31, 2018
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Feb. 28, 2017
Jul. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2015
Dec. 31, 2017
Business Acquisition [Line Items]                                
Goodwill acquired $ 29,200                 $ 29,200     $ 29,200     $ 29,172
Straight Path Communications Inc.                                
Business Acquisition [Line Items]                                
Aggregate purchase price           $ 3,100                    
Purchase price (USD per share)           $ 184.00                    
Payments to acquire assets           $ 700                    
Number of shares issued related to business acquisition     49                          
Equity issued related to business acquisition     $ 2,400                          
Deferred tax liability acquired     1,300                          
XO Holdings                                
Business Acquisition [Line Items]                                
Aggregate purchase price             $ 500 $ 1,500                
Business acquisition, purchase price in cash                       $ 300     $ 100  
Deferred tax liability acquired       $ 100                        
Other liabilities acquired       100                        
Property, plant, and equipment acquired             1,200                  
Business acquisition, other intangible assets acquired             200                  
Goodwill acquired             $ 100                  
Yahoo! Inc.                                
Business Acquisition [Line Items]                                
Aggregate purchase price 4,711 $ 4,761           4,480 $ 4,830              
Business acquisition, purchase price in cash 4,673 4,723                            
Property, plant, and equipment acquired 1,799 1,796               1,799     1,799      
Business acquisition, other intangible assets acquired 1,874 2,586               1,874     1,874      
Goodwill acquired $ 2,144 874               2,144     2,144      
Purchase price reduction due to Purchase Agreement Amendment               $ 350                
Post-closing liabilities arising from data breach percent retained               50.00%                
Post-closing liabilities arising from shareholders percent retained               100.00%                
Cash acquired   200     $ 200                      
Acquisition and integration related charges                   $ 100 $ 500   $ 200 $ 500    
Yahoo! Inc. | Restricted Stock Units                                
Business Acquisition [Line Items]                                
Outstanding restricted stock units to be awarded to employees who transferred from yahoo   $ 1,000                            
Wireless Licenses | Straight Path Communications Inc.                                
Business Acquisition [Line Items]                                
Indefinite-lived intangible assets acquired     $ 4,500                          
Wireless Licenses | XO Holdings                                
Business Acquisition [Line Items]                                
Indefinite-lived intangible assets acquired       $ 700