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Fair Value Measurement - Summary of Amortized Costs and Fair Value of Financial Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Amortized Cost    
Amortized Cost, Due within one year $ 0 $ 0
Amortized Cost, Due after one year through five years 2,275 2,275
Amortized Cost 2,275 2,275
Fair Value    
Fair Value, Due within one year 0 0
Fair Value, Due after one year through five years 2,324 2,328
Fair Value $ 2,324 $ 2,328