Restructuring Related Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		28 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2018
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 15	$ 26	$ 58	$ 61
Restructuring Reserve [Roll Forward]
Restructuring Charges	3	12	20	17
Restructuring Related Expenses		14	38	44
Other Restructuring Costs	12
2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost					$ 114
Restructuring Costs [Abstract]
Restructuring and Restructuring-related Cost, Cost Incurred to Date						$ 199
Payments for Restructuring			(76)		(172)
Restructuring Reserve [Roll Forward]
Payments for Restructuring			(76)		(172)
Restructuring Charges					84
Other Restructuring Costs					21
Transfer costs [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	10	11	33	35
Restructuring Reserve [Roll Forward]
Restructuring Charges	0	0	0	0
Restructuring Related Expenses		11	33	35
Other Restructuring Costs	10
Transfer costs [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date					93
Restructuring Costs [Abstract]
Payments for Restructuring			(33)		(92)
Restructuring Reserve [Roll Forward]
Payments for Restructuring			(33)		(92)
Termination Benefits [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost	6	11	21	14
Restructuring Reserve [Roll Forward]
Restructuring Charges	6	11	21	14
Restructuring Related Expenses		0	0	0
Other Restructuring Costs	0
Termination Benefits [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	17		22		17	17
Restructuring Costs [Abstract]
Payments for Restructuring			(26)		(53)
Restructuring Reserve [Roll Forward]
Restructuring Reserve Beginning Balance			22
Payments for Restructuring			(26)		(53)
Restructuring Reserve Ending Balance	17		17		17
Restructuring Charges			21		69
Other [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Incurred Cost		4	5	12
Restructuring and Restructuring Related Credits, Total	(1)
Restructuring Credit Recorded	(3)
Restructuring Reserve [Roll Forward]
Restructuring Charges		1	0	3
Restructuring Related Expenses		3	5	9
Other Restructuring Costs	2
Other [Member] | 2016 Restructuring Plan [Member]
Restructuring Costs [Abstract]
Payments for Restructuring			(16)		(26)
Restructuring Reserve [Roll Forward]
Payments for Restructuring			(16)		(26)
Restructuring Charges					$ 15
Minimum [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						275
Restructuring Costs [Abstract]
Restructuring plan estimated future cash outflow			250
Minimum [Member] | Restructuring Plan [Member] | Termination Benefits [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						80
Minimum [Member] | Restructuring Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						25
Minimum [Member] | Restructuring Related To Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						170
Maximum [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						325
Restructuring Costs [Abstract]
Restructuring plan estimated future cash outflow			300
Maximum [Member] | Restructuring Plan [Member] | Termination Benefits [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						90
Maximum [Member] | Restructuring Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						50
Maximum [Member] | Restructuring Related To Plan [Member] | Other [Member] | 2016 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring and Related Cost, Expected Cost						$ 185
Cost of Products Sold [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		11	33	35
Other Restructuring Costs	10
Cost of Products Sold [Member] | Transfer costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		11	33	35
Other Restructuring Costs	10
Cost of Products Sold [Member] | Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		0	0	0
Other Restructuring Costs	0
Cost of Products Sold [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		0	0	0
Other Restructuring Costs	0
Selling, General and Administrative Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		3	5	9
Other Restructuring Costs	2
Selling, General and Administrative Expenses [Member] | Transfer costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		0	0	0
Other Restructuring Costs	0
Selling, General and Administrative Expenses [Member] | Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		0	0	0
Other Restructuring Costs	0
Selling, General and Administrative Expenses [Member] | Other [Member]
Restructuring Reserve [Roll Forward]
Restructuring Related Expenses		$ 3	$ 5	$ 9
Other Restructuring Costs	$ 2