Stockholders' Equity (Schedule of Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cumulative translation adjustment, pre-tax	$ 189	$ (348)	$ (53)	$ (231)
Cumulative translation adjustment, tax	0	0	0	0
Cumulative translation adjustment, after-tax	189	(348)	(53)	(231)
Additions and revaluations of derivatives designated as cash flow hedges, pre-tax	(6)	11	30	14
Additions and revaluations of derivatives designated as cash flow hedges, tax	1	(5)	(14)	(6)
Additions and revaluations of derivatives designated as cash flow hedges, after-tax	(5)	6	16	8
Clearance of hedge results to earnings, pre-tax	(11)	25	(66)	77
Clearance of hedge results to earnings, tax	5	(9)	28	(29)
Clearance of hedge results to earnings, after-tax	(6)	16	(38)	48
Net revaluation and clearance of cash flow hedges to earnings, pre-tax	(17)	36	(36)	91
Net revaluation and clearance of cash flow hedges to earnings, tax	6	(14)	14	(35)
Net revaluation and clearance of cash flow hedges to earnings, after-tax	(11)	22	(22)	56
Unrealized gain (losses) on securities arising during the period, pre-tax	(5)	0	(5)	0
Unrealized gain (losses) on securities arising during the period, tax	2	0	2	0
Unrealized gain (losses) on securities arising during the period, after-tax	(3)	0	(3)	0
Reclassification of loss realized in net income, before tax	0	0	2	0
Reclassification of loss realized in net income, tax	0	0	(1)	0
Reclassification of loss realized in net income, net of tax	0	0	1	0
Net unrealized gain (loss) on securities	(5)	0	(3)	0
Net unrealized gain (loss) on securities, tax	2	0	1	0
Net unrealized gain (loss) on securities, net of tax	(3)	0	(2)	0
Other comprehensive income (loss), pre-tax	484	(170)	658	280
Other comprehensive income (loss), tax	(126)	(63)	(266)	(179)
Other comprehensive income (loss), after-tax	358	(233)	392	101
Pension Plans, Defined Benefit [Member]
Net (loss) gain, pre-tax	(609)	0	(628)	(3)
Net (loss) gain, tax	185	0	195	1
Net (loss) gain, after-tax	(424)	0	(433)	(2)
Prior service cost, pre-tax	0	0	22	(2)
Prior service cost, tax	0	0	(8)	0
Prior service cost, after-tax	0	0	14	(2)
Amortization of prior service cost (benefit), pre-tax	3	4	10	12
Amortization of prior service cost (benefit), tax	(1)	(2)	(3)	(4)
Amortization of prior service cost (benefit), after tax	2	2	7	8
Amortization of loss, pre-tax	222	153	661	459
Amortization of loss, tax	(75)	(52)	(227)	(158)
Amortization of loss, after tax	147	101	434	301
Curtailment, pre-tax	2	0	2	0
Curtailment, tax	(1)	0	(1)	0
Curtailment, after tax	1	0	1	0
Benefit plans, net, pre-tax	(382)	157	67	466
Benefit plans, net, tax	108	(54)	(44)	(161)
Benefit plans, net, after-tax	(274)	103	23	305
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net (loss) gain, pre-tax	(141)	0	(141)	0
Net (loss) gain, tax	51	0	51	0
Net (loss) gain, after-tax	(90)	0	(90)	0
Prior service cost, pre-tax	857	0	857	0
Prior service cost, tax	(299)	0	(299)	0
Prior service cost, after-tax	558	0	558	0
Amortization of prior service cost (benefit), pre-tax	(44)	(30)	(104)	(91)
Amortization of prior service cost (benefit), tax	16	10	36	32
Amortization of prior service cost (benefit), after tax	(28)	(20)	(68)	(59)
Amortization of loss, pre-tax	24	15	68	45
Amortization of loss, tax	(9)	(5)	(24)	(15)
Amortization of loss, after tax	15	10	44	30
Curtailment, pre-tax	3	0	3	0
Curtailment, tax	(1)	0	(1)	0
Curtailment, after tax	2	0	2	0
Benefit plans, net, pre-tax	699	(15)	683	(46)
Benefit plans, net, tax	(242)	5	(237)	17
Benefit plans, net, after-tax	$ 457	$ (10)	$ 446	$ (29)