Pension, Other Postretirement Benefits and Savings Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended																					3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2011 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2010 United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Foreign Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2011 Foreign Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2010 Foreign Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2012 United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2011 United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2010 United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2011 Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2010 Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2010 Close Of Tire Manufacturing Facility [Member]	Dec. 31, 2010 Participant Data For Prior Periods [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Annuity Purhcase to settle U.K. pension plan obligations [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2010 Purchase Of Annuities To Settle Canadian Pension Plan Obligations [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Change in Benefit Obligation [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2011 Change in Benefit Obligation [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Change in Benefit Obligation [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2011 Change in Benefit Obligation [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Change in Benefit Obligation [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2011 Change in Benefit Obligation [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2012 Prior Service Cost [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Prior Service Cost [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2011 Prior Service Cost [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2012 Net Actuarial Loss [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Net Actuarial Loss [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Net Actuarial Loss [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2012 Plans Not Fully Funded [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2011 Plans Not Fully Funded [Member] United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Plans Not Fully Funded [Member] Foreign Pension Plans, Defined Benefit [Member]	Dec. 31, 2011 Plans Not Fully Funded [Member] Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation																																			$ 6,756	$ 5,975	$ 2,668	$ 2,572
Pension Savings and Other Postretirement Benefit Plans (Textuals) [Abstract]
Settlements											15									(7)	9
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Loss in Next Fiscal Year																													17	1	(46)	211	63	13
Contributions to defined savings plans	97	98	93
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost										39	41	39	31	32	25	6	6	5					(39)	(41)	(31)	(32)	(6)	(6)
Interest cost										261	283	296	143	150	145	24	30	33					(261)	(283)	(143)	(150)	(24)	(30)
Expected return on plan assets										(299)	(306)	(280)	(117)	(131)	(126)	(1)	0	(1)
Amortization of prior service cost (credit)										23	23	31	2	2	2	(40)	(37)	(37)
Amortization of net losses										179	134	133	45	38	35	11	10	9
Net periodic cost										203	175	219	104	91	81	0	9	9
Curtailments/settlements										1	15	33	11	1	15	0	0	8	76			15
Termination benefits										0	0	43	1	1	0	0	0	0
Total benefits cost				(17)	(12)	(1)	17	21	18	204	190	295	116	93	96	0	9	17
Prior service cost (credit) from plan amendments										0	0	0	6	0	1	(82)	0	0
Increase (decrease) in net actuarial losses										665	735	143	372	45	(12)	(4)	15	59
Amortization of prior service (cost) credit in net periodic cost										(23)	(23)	(31)	(2)	(2)	(2)	40	37	37
Amortization of net losses in net periodc cost										(179)	(134)	(133)	(43)	(38)	(35)	(11)	(10)	(9)
Immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures										(1)	(15)	(40)	(11)	(4)	(16)	0	0	(8)
Total recognized in other comprehensive (income) loss before tax and minority										462	563	(61)	322	1	(64)	(57)	42	79
Total recognized in total benefits cost and other comprehensive (income) loss before tax and minority										666	753	234	438	94	32	(57)	51	96
Current assets	8,498	9,812								0	0		2	0		0	0
Noncurrent assets										0	0		33	33		0	0
Current liabilities	(5,322)	(5,929)								(8)	(10)		(23)	(21)		(39)	(52)
Noncurrent liabilities										(2,648)	(2,442)		(878)	(657)		(429)	(524)
Net amount recognized										$ (2,656)	$ (2,452)		$ (866)	$ (645)		$ (468)	$ (576)