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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. 30, 2017
Feb. 28, 2017
Jul. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]                
Acquisition related integration costs           $ 0 $ 553 $ 884
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     230          
Acquisition and integration related charges             473 762
Acquisition related severance costs             273 526
Acquisition related integration costs             $ 195 166
Acquisition related transaction costs               $ 70
Equity Awards | Yahoo! Inc.                
Business Acquisition [Line Items]                
Outstanding restricted stock units to be awarded to employees who transferred from yahoo     $ 1,000