Restructuring Related Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		20 Months Ended	47 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2014
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date						$ 354
Restructuring-related Costs Incurred to Date						115
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Cost Incurred to Date	$ 469		$ 469		$ 469	469
Payments for Restructuring	(20)		(46)			(426)
Restructuring Related Expenses	12	$ 10	28	$ 18
Restructuring and Related Cost, Incurred Cost	15	25	37	53
Restructuring Charges	3	15	9	35
2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date					107
Restructuring-related Costs Incurred to Date					76
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Cost Incurred to Date	183		183		183	183
Payments for Restructuring	(20)		(46)		(139)
Restructuring and Related Cost, Incurred Cost	15	27	40	50
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	286
Restructuring and Related Cost, Cost Incurred to Date	286		286		286	286
Payments for Restructuring	0		0			(287)
Restructuring and Related Cost, Incurred Cost	0	(2)	(3)	3
Termination Benefits [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	32		32		32	32	$ 43
Restructuring Charges Incurred to Date						216
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(9)		(18)			(182)
Restructuring Related Expenses	0	0	0	0
Restructuring and Related Cost, Incurred Cost	3	8	8	19
Restructuring Charges	3	8	8	19
Termination Benefits [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	32		32		32	32	39
Restructuring Charges Incurred to Date					81
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(9)		(18)		(49)
Restructuring and Related Cost, Incurred Cost	3	10	11	19
Restructuring Charges			11
Termination Benefits [Member] | 2011 Restructuring Plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	0		0		0	0	4
Restructuring Charges Incurred to Date						135
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	0		0			(133)
Restructuring and Related Cost, Incurred Cost	0	(2)	(3)	0
Restructuring Charges			(3)
Accelerated depreciation [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date						12
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	1	1	2	2
Restructuring and Related Cost, Incurred Cost	1	1	2	2
Restructuring Charges	0	0	0	0
Accelerated depreciation [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date					7
Estimated costs of restructuring program by major type of cost
Restructuring and Related Cost, Incurred Cost	1	1	2	2
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	0	0
Transfer costs [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date						40
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(8)		(16)			(40)
Restructuring Related Expenses	8	4	16	6
Restructuring and Related Cost, Incurred Cost	8	4	16	6
Restructuring Charges	0	0	0	0
Transfer costs [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring-related Costs Incurred to Date					40
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(8)		(16)		(40)
Restructuring and Related Cost, Incurred Cost	8	4	16	6
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			0
Restructuring and Related Cost, Incurred Cost	0	0	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	0	0
Restructuring and Related Cost, Incurred Cost	0	0	0	0
Restructuring Charges	0	0	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	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	0	0
Other [Member]
Restructuring and Related Cost [Line Items]
Restructuring Reserve	5		5		5	5	$ 6
Restructuring Charges Incurred to Date						139
Restructuring-related Costs Incurred to Date						63
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(3)		(12)			(204)
Restructuring Reserve, Accrual Adjustment			1
Restructuring Related Expenses	3	5	10	10
Restructuring and Related Cost, Incurred Cost	3	12	11	26
Restructuring Charges	0	7	1	16
Other [Member] | 2014 Restructuring plan [Member]
Restructuring and Related Cost [Line Items]
Restructuring Charges Incurred to Date					26
Restructuring-related Costs Incurred to Date					29
Estimated costs of restructuring program by major type of cost
Payments for Restructuring	(3)		(12)		(50)
Restructuring Reserve, Accrual Adjustment			0
Restructuring and Related Cost, Incurred Cost	3	12	11	23
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		0			(154)
Restructuring Reserve, Accrual Adjustment			1
Restructuring and Related Cost, Incurred Cost	0	0	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	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	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	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	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	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	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	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	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	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	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	$ 130
Cost of products sold [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	8	4	16	6
Cost of products sold [Member] | Termination Benefits [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0	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	0	0
Cost of products sold [Member] | Transfer costs [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	8	4	16	6
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	0	0
Cost of products sold [Member] | Other [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0	0	0
Selling, General and Administrative Expenses [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	4	6	12	12
Selling, General and Administrative Expenses [Member] | Termination Benefits [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0	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	2	2
Selling, General and Administrative Expenses [Member] | Transfer costs [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	0	0	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	0	0
Selling, General and Administrative Expenses [Member] | Other [Member]
Estimated costs of restructuring program by major type of cost
Restructuring Related Expenses	$ 3	$ 5	$ 10	$ 10