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Available-for-sale investments (Fair Values by Classification) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
Cash and cash equivalents	$ 3,000	$ 3,241	$ 3,485	$ 4,144
Marketable securities	38,351	34,844
Other noncurrent assets	2,016	1,625
Total available-for-sale investments	40,949	37,781
Available-for-sale investments [Member]
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
Cash and cash equivalents	2,455	2,783
Marketable securities	38,351	34,844
Other noncurrent assets	143	154
Total available-for-sale investments	$ 40,949	$ 37,781

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- Definition

Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets.

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

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-Publisher FASB
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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of noncurrent assets classified as other.

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