Stock Compensation - Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 252	$ 286	$ 277
COR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	40	47	48
R&D
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	60	60	62
SG&A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 152	169	156
Acquisition charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 10	$ 11