Stock-Based Compensation - Compensation (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amounts recognized in the financial statements
Stock-based compensation programs expense	$ 50	$ 60	$ 258	$ 266
Income tax benefits	(20)	(35)	(137)	(257)
Stock-based compensation expenses (benefits), net of tax	30	25	121	9
Cost of sales
Amounts recognized in the financial statements
Stock-based compensation programs expense	8	9	40	41
Selling, general and administrative expenses
Amounts recognized in the financial statements
Stock-based compensation programs expense	35	45	177	186
Research, development and related expenses
Amounts recognized in the financial statements
Stock-based compensation programs expense	$ 7	$ 6	$ 41	$ 39

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.

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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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