Stock-Based Compensation - Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts recognized in the financial statements
Stock-based compensation programs expense	$ 302	$ 324	$ 298
Income tax benefits	(154)	(327)	(272)
Stock-based compensation expenses (benefits), net of tax	148	(3)	26
ASU 2016-09 Improvements to Employee Share-Based Payment Accounting
Amounts recognized in the financial statements
Income tax benefits	(100)	(228)	(184)
Cost of sales
Amounts recognized in the financial statements
Stock-based compensation programs expense	48	49	47
Selling, general and administrative expenses
Amounts recognized in the financial statements
Stock-based compensation programs expense	207	229	206
Research, development and related expenses
Amounts recognized in the financial statements
Stock-based compensation programs expense	$ 47	$ 46	$ 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.

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