Restructuring and other cost savings initiatives (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Summary of restructuring charges by type of activity

The following tables summarize charges recorded related to the restructuring plan by type of activity and the locations recognized within the Consolidated Statements of Income (in millions):

	Year ended December 31, 2015
	Separation costs		Asset impairments/ disposals			Accelerated depreciation		Other		Total
Cost of sales	$	—	$	—		$	50	$	2	$	52
Research and development	—		—			36		28		64
Selling, general and administrative	—		—			14		42		56
Other	49		(111		)	—		4		(58		)
Total	$	49	$	(111	)	$	100	$	76	$	114

	Year ended December 31, 2014
	Separation costs		Asset impairments		Accelerated depreciation		Other		Total
Cost of sales	$	—	$	81	$	23	$	—	$	104
Research and development	—		—		28		21		49
Selling, general and administrative	—		—		4		5		9
Other	377		6		—		13		396
Total	$	377	$	87	$	55	$	39	$	558

Restructuring liabilities roll forward

The following table summarizes the expenses (excluding non-cash charges) and payments related to the restructuring plan (in millions):

	Years ended December 31,
	Separation costs			Other			Total
Restructuring liabilities as of December 31, 2013	$	—		$	—		$	—
Expense	353			32			385
Payments	(132		)	(9		)	(141		)
Restructuring liabilities as of December 31, 2014	221			23			244
Expense	52			80			132
Payments	(178		)	(80		)	(258		)
Restructuring liabilities as of December 31, 2015	95			23			118
Expense	6			13			19
Payments	(90		)	(27		)	(117		)
Restructuring liabilities as of December 31, 2016	11			9			20
Expense	72			7			79
Payments	(20		)	$	(11	)	(31		)
Restructuring liabilities as of December 31, 2017	$	63		$	5		$	68