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Acquisitions and Divestitures - Acquisition of Yahoo! Inc.'s Operating Business (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 13, 2017
Feb. 28, 2017
Jul. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                
Acquisition related integration costs           $ 553 $ 884 $ 0
Yahoo! Inc.                
Business Acquisition [Line Items]                
Business acquisition, purchase price in cash $ 4,673 $ 4,673   $ 4,480 $ 4,830      
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%        
Business acquisition consideration $ 4,711 $ 4,711 $ 4,700          
Cash acquired     200          
Acquisition and integration related charges           500 800  
Acquisition related severance costs           300 500  
Acquisition related integration costs           $ 200 200  
Acquisition related transaction costs             $ 100  
Equity Awards | Yahoo! Inc.                
Business Acquisition [Line Items]                
Outstanding restricted stock units to be awarded to employees who transferred from yahoo     $ 1,000