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Available-for-sale investments (Fair Values by Contractual Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair values of available-for-sale debt security investments by contractual maturity
Total available-for-sale investments	$ 40,949	$ 37,781
Total interest-bearing securities [Member]
Fair values of available-for-sale debt security investments by contractual maturity
Maturing in one year or less	6,478	8,393
Maturing after one year through three years	12,912	10,404
Maturing after three years through five years	13,830	12,157
Maturing after five years through ten years	3,252	2,974
Maturing after ten years	63	40
Mortgage- and asset-backed securities	4,271	3,659
Total available-for-sale investments	$ 40,806	$ 37,627

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Fair values of available-for-sale investments by contractual maturity.

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This item represents the fair value of debt securities which are expected to mature after one year through three years of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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