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Investments - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Investments [Abstract]        
Investment securities in a continuous loss position for greater than 12 months, estimated fair value $ 696,000,000 $ 696,000,000   $ 360,000,000
Investment securities in a continuous loss position for greater than 12 months, unrealized losses 14,000,000 14,000,000   $ 0
Business Acquisition [Line Items]        
Gain on sale   $ 572,000,000 $ 21,000,000  
Glosis        
Business Acquisition [Line Items]        
Gain on relinquishment of investment 266,000,000      
Flipkart [Member]        
Business Acquisition [Line Items]        
Gain on sale $ 313,000,000