Restructuring Related Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		44 Months Ended	18 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date			$ 351
Restructuring-related Costs Incurred to Date			103
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Cost Incurred to Date	454		454	454
Payments for Restructuring	(26)		(406)
Restructuring Related Expenses	16	8
Restructuring and Related Cost, Incurred Cost	22	28
Restructuring Charges	6	20
2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date				104
Restructuring-related Costs Incurred to Date				64
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Cost Incurred to Date	168		168	168
Payments for Restructuring	(26)			(119)
Restructuring and Related Cost, Incurred Cost	25	23
2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date			247
Restructuring-related Costs Incurred to Date			39
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	286		286	286
Restructuring and Related Cost, Cost Incurred to Date	286		286	286
Payments for Restructuring	0		(287)
Restructuring and Related Cost, Incurred Cost	(3)	5
Termination Benefits [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	38		38	38	43
Restructuring Charges Incurred to Date			213
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(9)		(173)
Restructuring Related Expenses	0	0
Restructuring and Related Cost, Incurred Cost	5	11
Restructuring Charges	5	11
Termination Benefits [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	38		38	38	39
Restructuring Charges Incurred to Date				78
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(9)			(40)
Restructuring and Related Cost, Incurred Cost	8	9
Restructuring Charges	8
Termination Benefits [Member] | 2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	0		0	0	4
Restructuring Charges Incurred to Date			135
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	0		(133)
Restructuring and Related Cost, Incurred Cost	(3)	2
Restructuring Charges	(3)
Accelerated depreciation [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date			11
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	1	1
Restructuring and Related Cost, Incurred Cost	1	1
Restructuring Charges	0	0
Accelerated depreciation [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date				6
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Incurred Cost	1	1
Accelerated depreciation [Member] | 2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date			5
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Incurred Cost	0	0
Transfer costs [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date			32
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(8)		(32)
Restructuring Related Expenses	8	2
Restructuring and Related Cost, Incurred Cost	8	2
Restructuring Charges	0	0
Transfer costs [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date				32
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(8)			(32)
Restructuring and Related Cost, Incurred Cost	8	2
Transfer costs [Member] | 2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date			0
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	0		0
Restructuring and Related Cost, Incurred Cost	0	0
Impairment of an asset in value [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date			(1)
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Restructuring and Related Cost, Incurred Cost	0	0
Restructuring Charges	0	0
Impairment of an asset in value [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date				0
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Incurred Cost	0	0
Impairment of an asset in value [Member] | 2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date			(1)
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Incurred Cost	0	0
Other [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	6		6	6	6
Restructuring Charges Incurred to Date			139
Restructuring-related Costs Incurred to Date			60
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(9)		(201)
Restructuring Reserve, Accrual Adjustment	1
Restructuring Related Expenses	7	5
Restructuring and Related Cost, Incurred Cost	8	14
Restructuring Charges	1	9
Other [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date				26
Restructuring-related Costs Incurred to Date				26
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(9)			(47)
Restructuring Reserve, Accrual Adjustment	0
Restructuring and Related Cost, Incurred Cost	8	11
Other [Member] | 2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date			113
Restructuring-related Costs Incurred to Date			34
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	0		(154)
Restructuring Reserve, Accrual Adjustment	1
Restructuring and Related Cost, Incurred Cost	0	3
Restructuring Plan [Member] | Termination Benefits [Member] | 2011 Restructuring Plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	135		135	135
Restructuring Plan [Member] | Other [Member] | 2011 Restructuring Plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	112		112	112
Restructuring Related To Plan [Member] | Other [Member] | 2011 Restructuring Plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	39		39	39
Minimum [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	250		250	250
Restructuring plan estimated future cash outflow	235
Minimum [Member] | Restructuring Plan [Member] | Termination Benefits [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	115		115	115
Minimum [Member] | Restructuring Plan [Member] | Other [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	25		25	25
Minimum [Member] | Restructuring Related To Plan [Member] | Other [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	110		110	110
Maximum [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	300		300	300
Restructuring plan estimated future cash outflow	285
Maximum [Member] | 2011 Restructuring Plan [Member]
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Cost Incurred to Date		53
Maximum [Member] | Restructuring Plan [Member] | Termination Benefits [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	135		135	135
Maximum [Member] | Restructuring Plan [Member] | Other [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	35		35	35
Maximum [Member] | Restructuring Related To Plan [Member] | Other [Member] | 2014 Restructuring plan [Member]
Estimated costs of restructuring program by major type of cost
Expected total costs associated with the plan	130		130	130
Cost of products sold [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	8	2
Cost of products sold [Member] | Termination Benefits [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Cost of products sold [Member] | Accelerated depreciation [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Cost of products sold [Member] | Transfer costs [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	8	2
Cost of products sold [Member] | Impairment of an asset in value [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Cost of products sold [Member] | Other [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Selling, General and Administrative Expenses [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	8	6
Selling, General and Administrative Expenses [Member] | Termination Benefits [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Selling, General and Administrative Expenses [Member] | Accelerated depreciation [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	1	1
Selling, General and Administrative Expenses [Member] | Transfer costs [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Selling, General and Administrative Expenses [Member] | Impairment of an asset in value [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0
Selling, General and Administrative Expenses [Member] | Other [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	$ 7	$ 5