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Acquisitions and Divestitures - Acquisition of AOL Inc. (Details) - AOL Inc - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended
Jun. 23, 2015
Oct. 31, 2018
May 31, 2015
Business Acquisition [Line Items]      
Business acquisition, share price (in 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    
Payments for legal settlements   $ 219