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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost
Within one year	$ 21,130
After one year through five years	2,313
After five years through ten years	58
After ten years	22
Amortized Cost	23,523	$ 29,685
Fair Value
Within one year	21,075
After one year through five years	2,299
After five years through ten years	57
After ten years	22
Fair Value	$ 23,453	$ 29,587

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