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Strategic Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Document Period End Date Mar. 31, 2019  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity $ 226  
Equity method investments 199 $ 303
Measurement alternative investments (1) 112 94
Publicly-held equity securities (2) 1 0
Notes receivable 31 26
Investments 342 $ 424
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 914