Stockholders' Equity - Schedule of Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cumulative translation adjustment, pre-tax	$ 170	$ 44
Cumulative translation adjustment, tax	0	0
Cumulative translation adjustment, after-tax	170	44
Additions and revaluations of derivatives designated as cash flow hedges, pre-tax	(2)	8
Additions and revaluations of derivatives designated as cash flow hedges, tax	0	(3)
Additions and revaluations of derivatives designated as cash flow hedges, after-tax	(2)	5
Clearance of hedge results to earnings, pre-tax	(32)	27
Clearance of hedge results to earnings, tax	13	(11)
Clearance of hedge results to earnings, after-tax	(19)	16
Net revaluation and clearance of cash flow hedges to earnings, pre-tax	(34)	35
Net revaluation and clearance of cash flow hedges to earnings, tax	13	(14)
Net revaluation and clearance of cash flow hedges to earnings, after-tax	(21)	21
Unrealized gain (losses) on securities, pre-tax	1	1
Unrealized gain (losses) on securities, tax	0	0
Unrealized gain (losses) on securities, after-tax	1	1
Other comprehensive income (loss), pre-tax	351	222
Other comprehensive income (loss), tax	(64)	(62)
Other comprehensive income (loss), after-tax	287	160
Pension Plans, Defined Benefit [Member]
Net (loss) gain, pre-tax	(23)	0
Net (loss) gain, tax	3	0
Net (loss) gain, after-tax	(20)	0
Prior service cost, pre-tax	22	0
Prior service cost, tax	(7)	0
Prior service cost, after-tax	15	0
Amortization of prior service cost (benefit), pre-tax	4	4
Amortization of prior service cost (benefit), tax	(1)	(1)
Amortization of prior service cost (benefit), after tax	3	3
Amortization of loss, pre-tax	219	153
Amortization of loss, tax	(75)	(53)
Amortization of loss, after tax	144	100
Benefit plans, net, pre-tax	222	157
Benefit plans, net, tax	(80)	(54)
benefit plans, net, after-tax	142	103
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amortization of prior service cost (benefit), pre-tax	(30)	(30)
Amortization of prior service cost (benefit), tax	11	11
Amortization of prior service cost (benefit), after tax	(19)	(19)
Amortization of loss, pre-tax	22	15
Amortization of loss, tax	(8)	(5)
Amortization of loss, after tax	14	10
Benefit plans, net, pre-tax	(8)	(15)
Benefit plans, net, tax	3	6
benefit plans, net, after-tax	$ (5)	$ (9)