Stockholders' Equity (Change in Components of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unrealized translation, Pretax Amount	$ (243)	$ 332	$ 619
Unrealized translation, Tax Effect	(7)	(6)	0
Unrealized translation, Net Amount	249	(334)	(625)
Other Comprehensive Income (Loss), Pretax Amount	(528)	367	627
Other Comprehensive Income (Loss), Tax Effect	128	0	(37)
Other Comprehensive Income (Loss), Net Amount	(400)	367	590
Purchase of subsidiary shares from noncontrolling interests, Pretax Amount	0	0	(37)
Purchase of subsidiary from noncontrolling interest, Tax Effect	0	0	0
Purchase of subsidiary shares from noncontrolling interests, Net Amount	0	0	(37)
Change in accumulated other comprehensive income (loss), Pretax Amount	(528)	367	590
Changed in accumulated other comprehensive income (loss), Tax Effect	128	0	(37)
Change in accumulated other comprehensive income (loss), Net Amount	(400)	367	553
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized translation, Net Amount	(236)	326	619
The Corporation [Member]
Unrealized translation, Net Amount	(236)	326	619
Cash Flow Hedges and Other [Member]
Recognition of effective portion of hedges, Pretax Amount	(81)	(37)	(29)
Recognition of effective portion of hedges, Tax Effect	34	14	8
Recognition of effective portion of hedges, Net Amount	(47)	(23)	(21)
Amortization included in net income, Pretax Amount	39	17	45
Amortization included in net income, Tax Effect	(12)	(5)	(18)
Amortization included in net income, Net Amount	27	12	27
Currency and other, Pretax Amount	(13)	(8)	(3)
Currency and other, Tax Effect	2	3	0
Currency and other, Net Amount	(11)	(5)	(3)
Other Comprehensive Income, Cash Flow Hedges and Other, Before Tax	(55)	(28)	13
Other Comprehensive Income, Cash Flow Hedges and Other, Tax	24	12	(10)
Other Comprehensive Income, Cash Flow Hedges and Other, Net Of Tax	(31)	(16)	3
Defined Benefit Pension [Member]
Total Defined Benefit Pension Plans, Pretax Amount	(231)	51	(15)
Total Defined Benefit Pension Plans, Tax Effect	99	(10)	(22)
Total Defined Benefit Pension Plans, Net Amount	(132)	41	(37)
Defined Benefit Pension [Member] | Unrecognized net actuarial loss and transition amount [Member]
Funded status recognition, Pretax Amount	(396)	(58)	(111)
Funded status recognition, Tax Effect	(144)	(23)	(19)
Funded status recognition, Net Amount	(252)	(35)	(92)
Amortization included in net periodic benefit cost, Pretax Amount	94	99	111
Amortization included in net periodic benefit cost, Tax Effect	(33)	(34)	(40)
Amortization included in net periodic benefit cost, Net Amount	61	65	71
Currency and other, Pretax Amount	2	(10)	36
Currency and other, Tax Effect	5	1	7
Currency and other, Net Amount	3	11	(29)
Total Unrecognized Net Actuarial Loss and Transition Amount, Pretax Amount	(304)	51	(36)
Total Unrecognized Net Actuarial Loss and Transition Amount, Tax Effect	116	(10)	(14)
Total Unrecognized Net Actuarial Loss and Transition Amount, Net Amount	(188)	41	(50)
Defined Benefit Pension [Member] | Unrecognized prior service cost [Member]
Funded status recognition, Pretax Amount	74	(1)	18
Funded status recognition, Tax Effect	17	0	6
Funded status recognition, Net Amount	57	(1)	12
Amortization included in net periodic benefit cost, Pretax Amount	(3)	(2)	(3)
Amortization included in net periodic benefit cost, Tax Effect	1	1	(1)
Amortization included in net periodic benefit cost, Net Amount	2	1	2
Currency and other, Pretax Amount	4	1	0
Currency and other, Tax Effect	(1)	(1)	(1)
Currency and other, Net Amount	(3)	0	(1)
Total Unrecognized Prior Service Cost, Pretax Amount	73	0	21
Total Unrecognized Prior Service Cost, Tax Effect	(17)	0	(8)
Total Unrecognized Prior Service Cost, Net Amount	56	0	13
Other Postretirement Benefit Plans, Defined Benefit [Member]
Total Defined Benefit Pension Plans, Pretax Amount	1	12	10
Total Defined Benefit Pension Plans, Tax Effect	(2)	4	(5)
Total Defined Benefit Pension Plans, Net Amount	(1)	16	5
Other Postretirement Benefit Plans, Defined Benefit [Member] | Unrecognized net actuarial loss and transition amount [Member]
Funded status recognition, Pretax Amount	(31)	10	9
Funded status recognition, Tax Effect	(10)	(8)	5
Funded status recognition, Net Amount	(21)	18	4
Amortization included in net periodic benefit cost, Pretax Amount	0	(1)	0
Amortization included in net periodic benefit cost, Tax Effect	0	(4)	0
Amortization included in net periodic benefit cost, Net Amount	0	(3)	0
Currency and other, Pretax Amount	0	(1)	1
Currency and other, Tax Effect	0	1	1
Currency and other, Net Amount	0	0	0
Total Unrecognized Net Actuarial Loss and Transition Amount, Pretax Amount	(31)	10	8
Total Unrecognized Net Actuarial Loss and Transition Amount, Tax Effect	10	5	(4)
Total Unrecognized Net Actuarial Loss and Transition Amount, Net Amount	(21)	15	4
Other Postretirement Benefit Plans, Defined Benefit [Member] | Unrecognized prior service cost [Member]
Funded status recognition, Pretax Amount	31	0	0
Funded status recognition, Tax Effect	(11)	0	0
Funded status recognition, Net Amount	20	0	0
Amortization included in net periodic benefit cost, Pretax Amount	(1)	(3)	(2)
Amortization included in net periodic benefit cost, Tax Effect	(1)	(1)	(1)
Amortization included in net periodic benefit cost, Net Amount	0	2	1
Currency and other, Pretax Amount	0	1	0
Currency and other, Tax Effect	0	0	0
Currency and other, Net Amount	0	(1)	0
Total Unrecognized Prior Service Cost, Pretax Amount	32	2	2
Total Unrecognized Prior Service Cost, Tax Effect	(12)	(1)	(1)
Total Unrecognized Prior Service Cost, Net Amount	$ 20	$ 1	$ 1