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Investments (Fair Values by Contractual Maturity) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Maturing in one year or less	$ 13,265	$ 6,733
Maturing after one year through three years	4,066	12,820
Maturing after three years through five years	7,940	13,836
Maturing after five years through ten years	1,334	3,263
Maturing after ten years	0	52
Mortgage- and asset-backed securities	2,231	4,465
Total available-for-sale investments	$ 28,836	$ 41,169

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Available-For Sale Securities, Debt Maturities, After One Through Three Years, Fair Value

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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