Pension, Other Postretirement Benefits and Savings Plans (Weighted Assumptions) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements		(15)
Discount rate:	3.71%	4.52%
Discount rate: (benfit costs)	4.52%	5.20%	5.75%
Expected long term return on plan assets:	8.50%	8.50%	8.50%
Accumulated benefit obligation	6,738	5,961
Total recognized in other comprehensive (income) loss before tax and minority	462	563	(61)
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	3.30%	4.12%		3.00%
Discount rate: (benfit costs)	3.98%	4.62%	5.45%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total recognized in other comprehensive (income) loss before tax and minority	(57)	42	79
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	4.12%	5.07%
Rate of compensation increase:	3.23%	3.36%
Discount rate: (benfit costs)	5.07%	5.54%	5.68%
Expected long term return on plan assets:	5.56%	6.29%	6.60%
Rate of compensation increase (benefit cost):	3.36%	3.43%	3.94%
Accumulated benefit obligation	3,094	2,659
Total recognized in other comprehensive (income) loss before tax and minority	322	1	(64)
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	5.64%	5.88%		4.00%
Rate of compensation increase:	4.12%	3.71%
Discount rate: (benfit costs)	5.91%	6.52%	6.79%
Rate of compensation increase (benefit cost):	3.71%	3.99%	4.21%
Plans Not Fully Funded [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	6,756	5,975
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	6,738	5,961
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	4,100	3,523
Plans Not Fully Funded [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	2,668	2,572
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	2,564	2,505
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	1,770	1,899
Certain Unfunded Non US Subsidiaries [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation	318	249
Defined Benefit Plan, Benefit Obligation	366	270
Total recognized in other comprehensive (income) loss before tax and minority	99	35
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	275
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	325
Canadian Other Postretirement Benefit Plans, Change in Benefit Obligation [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:		4.25%
Defined Benefit Plan, Benefit Obligation				18
U.S. Other Postretirement Benefit Plans, Change in Benefit Obligation [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:		4.00%
Defined Benefit Plan, Benefit Obligation				56