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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 9 Months Ended 12 Months Ended
Jun. 13, 2017
Jun. 23, 2015
Oct. 31, 2018
Feb. 28, 2018
Jan. 31, 2018
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Feb. 28, 2017
Jul. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2015
Dec. 31, 2017
May 31, 2015
Business Acquisition [Line Items]                                    
Goodwill acquired                     $ 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       49.0                            
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                    
AOL Inc.                                    
Business Acquisition [Line Items]                                    
Purchase price (USD per share)                                   $ 50.00
Business acquisition, purchase price in cash   $ 3,800                                
Number of shares exercised under appraisal rights of Delaware law   6.6                                
Yahoo! Inc.                                    
Business Acquisition [Line Items]                                    
Aggregate purchase price $ 4,711               4,480 $ 4,830                
Business acquisition, purchase price in cash 4,673                                  
Property, plant, and equipment acquired 1,799                                  
Business acquisition, other intangible assets acquired 1,874                                  
Goodwill acquired 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 $ 100   $ 300 $ 600      
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                          
Subsequent Event | AOL Inc.                                    
Business Acquisition [Line Items]                                    
Payments for legal settlements     $ 200