Stockholders' Equity (Schedule of Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Cumulative translation adjustment, pre-tax	$ (412)	$ 73	$ (242)	$ 117
Cumulative translation adjustment, tax	0	0	0	0
Cumulative translation adjustment, after-tax	(412)	73	(242)	117
Additions and revaluations of derivatives designated as cash flow hedges, pre-tax	38	(5)	36	3
Additions and revaluations of derivatives designated as cash flow hedges, tax	(15)	2	(15)	(1)
Additions and revaluations of derivatives designated as cash flow hedges, after-tax	23	(3)	21	2
Clearance of hedge results to earnings, pre-tax	(23)	25	(55)	52
Clearance of hedge results to earnings, tax	10	(9)	23	(20)
Clearance of hedge results to earnings, after-tax	(13)	16	(32)	32
Net revaluation and clearance of cash flow hedges to earnings, pre-tax	15	20	(19)	55
Net revaluation and clearance of cash flow hedges to earnings, tax	(5)	(7)	8	(21)
Net revaluation and clearance of cash flow hedges to earnings, after-tax	10	13	(11)	34
Unrealized gain (losses) on securities arising during the period, pre-tax	(1)	(1)	0	0
Unrealized gain (losses) on securities arising during the period, tax	0	0	0	0
Unrealized gain (losses) on securities arising during the period, after-tax	(1)	(1)	0	0
Reclassification of loss realized in net income, before tax	2	0	2	0
Reclassification of loss realized in net income, tax	(1)	0	(1)	0
Reclassification of loss realized in net income, net of tax	1	0	1	0
Net unrealized gain (loss) on securities	1	(1)	2	0
Net unrealized gain (loss) on securities, tax	(1)	0	(1)	0
Net unrealized gain (loss) on securities, net of tax	0	(1)	1	0
Other comprehensive income (loss), pre-tax	(177)	228	174	450
Other comprehensive income (loss), tax	(76)	(54)	(140)	(116)
Other comprehensive income (loss), after-tax	(253)	174	34	334
Pension Plans, Defined Benefit [Member]
Net (loss) gain, pre-tax	4	(3)	(19)	(3)
Net (loss) gain, tax	7	1	10	1
Net (loss) gain, after-tax	11	(2)	(9)	(2)
Prior service cost, pre-tax	0	(2)	22	(2)
Prior service cost, tax	(1)	0	(8)	0
Prior service cost, after-tax	(1)	(2)	14	(2)
Amortization of prior service cost (benefit), pre-tax	3	4	7	8
Amortization of prior service cost (benefit), tax	(1)	(1)	(2)	(2)
Amortization of prior service cost (benefit), after tax	2	3	5	6
Amortization of loss, pre-tax	220	153	439	306
Amortization of loss, tax	(77)	(53)	(152)	(106)
Amortization of loss, after tax	143	100	287	200
Benefit plans, net, pre-tax	227	152	449	309
Benefit plans, net, tax	(72)	(53)	(152)	(107)
benefit plans, net, after-tax	155	99	297	202
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amortization of prior service cost (benefit), pre-tax	(30)	(31)	(60)	(61)
Amortization of prior service cost (benefit), tax	9	11	20	22
Amortization of prior service cost (benefit), after tax	(21)	(20)	(40)	(39)
Amortization of loss, pre-tax	22	15	44	30
Amortization of loss, tax	(7)	(5)	(15)	(10)
Amortization of loss, after tax	15	10	29	20
Benefit plans, net, pre-tax	(8)	(16)	(16)	(31)
Benefit plans, net, tax	2	6	5	12
benefit plans, net, after-tax	$ (6)	$ (10)	$ (11)	$ (19)