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Investments - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Investment securities in a continuous unrealized loss position for less then 12 months $ 774 $ 2,900  
Investment securities in a continuous loss position for less than 12 months, unrealized losses $ 92 2,700  
Investment securities in a continuous loss position for greater than 12 months, unrealized losses   41  
Weighted average remaining duration 2 months    
Cash investment to acquire ownership interest     $ 50
Gain on sale of investment $ 0 572 (49)
Cumulative downward adjustments for price changes and impairment 81    
Purchase of investments 46,977 28,115 14,599
Gain on sale of business (52) 0 167
Cost method investment impairment charge     61
Glosis      
Business Acquisition [Line Items]      
Gain on relinquishment of investment   266  
Flipkart      
Business Acquisition [Line Items]      
Gain on sale of investment   313  
eBay.in Business      
Business Acquisition [Line Items]      
Gain on sale of business     167
Flipkart      
Business Acquisition [Line Items]      
Cash investment to acquire ownership interest     725
Purchase of investments     $ 500
Ownership interest received     5.44%
Paytm Mall      
Business Acquisition [Line Items]      
Cash investment to acquire ownership interest 160 $ 0 $ 0
Other Investments      
Business Acquisition [Line Items]      
Cash investment to acquire ownership interest $ 40