Stockholders' Equity (Schedule of Components of Other Comprehensive Income / (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative translation adjustment, pre-tax	$ (876)		$ 25		$ 77
Cumulative translation adjustment, tax	0		0		0
Cumulative translation adjustment, after-tax	(876)		25		77
Additions and revaluations of derivatives designated as cash flow hedges, pre-tax	53	[1]	(58)	[1]	8	[1]
Additions and revaluations of derivatives designated as cash flow hedges, tax	(20)		22		(6)
Additions and revaluations of derivatives designated as cash flow hedges, after-tax	33		(36)		2
Clearance of hedge results to earnings, pre-tax	15		(25)		(65)
Net revaluation and clearance of cash flow hedges to earnings, pre-tax	68		(83)		(57)
Net revaluation and clearance of cash flow hedges to earnings, tax	(26)		32		22
Net revaluation and clearance of cash flow hedges to earnings, after-tax	42		(51)		(35)
Net unrealized gain (loss) on securities, pre-tax	0		1		(2)
Net unrealized gain (loss) on securities, tax	0		(1)		1
Net unrealized gain (loss) on securities, after-tax	0		0		(1)
Other comprehensive (loss) income, before tax	(4,668)		4,868		253
Other comprehensive (loss) income, tax	1,403		(1,665)		(121)
Other comprehensive (loss) income, after-tax	(3,265)		3,203		132
Pension Benefit Plans, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (loss) gain, pre-tax	(4,131)	[1]	3,293	[1]	(1,433)	[1]
Net (loss) gain, tax	1,497		(1,136)		437
Net (loss) gain, after-tax	(2,634)		2,157		(996)
Prior service benefit, pre-tax	44	[1]	62	[1]	22	[1]
Prior service benefit, tax	(11)		(22)		(8)
Prior service benefit, after-tax	33		40		14
Amortization of prior service cost (benefit), pre-tax	2	[2]	8	[2]	13	[2]
Amortization of prior service cost (benefit), tax	0		(2)		(4)
Amortization of prior service cost (benefit), after-tax	2		6		9
Amortization of loss, pre-tax	601	[2]	957	[2]	887	[2]
Amortization of loss, tax	(209)		(331)		(305)
Amortization of loss, after-tax	392		626		582
Curtailment (gain) loss, pre-tax	4	[2]	1	[2]	2	[2]
Curtailment (gain) loss, tax	(1)		0		0
Curtailment (gain) loss, after-tax	3		1		2
Settlement loss, pre-tax	7	[2]	152	[2]	5	[2]
Settlement loss, tax	(2)		(45)		(2)
Settlement loss, after-tax	5		107		3
Benefit plans, net, pre-tax	(3,473)		4,473		(504)
Benefit plans, net, tax	1,274		(1,536)		118
Benefit plans, net, after-tax	(2,199)		2,937		(386)
Other Long-Term Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net (loss) gain, pre-tax	(280)	[1]	513	[1]	(60)	[1]
Net (loss) gain, tax	100		(184)		17
Net (loss) gain, after-tax	(180)		329		(43)
Prior service benefit, pre-tax	50	[1]	211	[1]	857	[1]
Prior service benefit, tax	(1)		(72)		(299)
Prior service benefit, after-tax	49		139		558
Amortization of prior service cost (benefit), pre-tax	(214)	[2]	(195)	[2]	(155)	[2]
Amortization of prior service cost (benefit), tax	76		69		54
Amortization of prior service cost (benefit), after-tax	(138)		(126)		(101)
Amortization of loss, pre-tax	57	[2]	76	[2]	94	[2]
Amortization of loss, tax	(20)		(27)		(33)
Amortization of loss, after-tax	37		49		61
Curtailment (gain) loss, pre-tax	0	[2]	(154)	[2]	3	[2]
Curtailment (gain) loss, tax	0		54		(1)
Curtailment (gain) loss, after-tax	0		(100)		2
Settlement loss, pre-tax	0	[2]	1	[2]	0	[2]
Settlement loss, tax	0		0		0
Settlement loss, after-tax	0		1		0
Benefit plans, net, pre-tax	(387)		452		739
Benefit plans, net, tax	155		(160)		(262)
Benefit plans, net, after-tax	(232)		292		477
Foreign Currency Contract [Member] | Net sales [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Clearance of hedge results to earnings, pre-tax	(15)		(1)		(21)
Clearance of hedge results to earnings, tax	5		0		8
Clearance of hedge results to earnings, after-tax	(10)		(1)		(13)
Commodity Contract [Member] | Cost of goods sold [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Clearance of hedge results to earnings, pre-tax	30		(24)		(44)
Clearance of hedge results to earnings, tax	(11)		10		20
Clearance of hedge results to earnings, after-tax	$ 19		$ (14)		$ (24)

[1] These amounts represent changes in accumulated other comprehensive income excluding changes due to reclassifying amounts to the Consolidated Income Statements.

[2] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost of the company's pension and other long-term employee benefit plans. See Note 17 for additional information.