Pension, Other Postretirement Benefits and Savings Plans (Estimated Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 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]
2013	$ 426
2014	407
2015	425
2016	423
2017	421
2018-2022	2,100
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2013	154
2014	155
2015	159
2016	167
2017	170
2018-2022	930
Other Postretirement Benefits Without Medicare Part D Subsidy [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2013	42
2014	37
2015	36
2016	35
2017	34
2018-2022	162
Other Postretirement Benefits Medicare Part D Subsidy Receipts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2013	(1)
2014	(1)
2015	(1)
2016	(1)
2017	(1)
2018-2022	$ (6)