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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Within one year	$ 22,010
After one year through five years	3,016
After five years through ten years	19
After ten years	17
Amortized Cost	25,062	$ 24,216
Fair Value
Within one year	22,008
After one year through five years	3,015
After five years through ten years	19
After ten years	17
Available-for-sale debt securities	$ 25,059	$ 24,164

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