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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, 2018	Dec. 31, 2017
Amortized Cost
Within one year	$ 16,861
After one year through five years	5,710
After five years through ten years	67
After ten years	24
Amortized Cost	22,662	$ 29,685
Fair Value
Within one year	16,822
After one year through five years	5,649
After five years through ten years	66
After ten years	24
Fair Value	$ 22,561	$ 29,587

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