Stock-Based Compensation - Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amounts recognized in the financial statements
Stock-based compensation programs expense	$ 324	$ 298	$ 276
Income tax benefits	(327)	(272)	(87)
Stock-based compensation expenses (benefits), net of tax	(3)	26	189
ASU 2016-09 Improvements to Employee Share-Based Payment Accounting
Amounts recognized in the financial statements
Income tax benefits	(228)	(184)
Cost of sales
Amounts recognized in the financial statements
Stock-based compensation programs expense	49	47	46
Selling, general and administrative expenses
Amounts recognized in the financial statements
Stock-based compensation programs expense	229	206	185
Research, development and related expenses
Amounts recognized in the financial statements
Stock-based compensation programs expense	$ 46	$ 45	$ 45

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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