Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Total, Beginning Balance			$ (362)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			27
Other comprehensive income (loss)	56	19	24	63
Total, Ending Balance	(338)		(338)
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Sales Revenue, Goods, Net	(887)	(1,077)	(3,037)	(3,598)
Reclassifications before income tax	(260)	(277)	(889)	(1,006)
Provision (benefit) for income taxes	62	77	260	281
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Reclassifications before income tax			44
Provision (benefit) for income taxes			(17)
Reclassifications during the period			27
Cash flow hedging activities [Member]
Total, Beginning Balance			(1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(1)
Other comprehensive income (loss)			0
Total, Ending Balance	(1)		(1)
Cash flow hedging activities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Reclassifications before income tax			(1)
Cash flow hedging activities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Energy Commodity Contract [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Sales Revenue, Goods, Net			(1)
Foreign currency translation [Member]
Total, Beginning Balance			169
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(31)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Other comprehensive income (loss)			(31)
Total, Ending Balance	138		138
Pension and other postretirement benefits [Member]
Total, Beginning Balance			(530)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			27
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			28
Other comprehensive income (loss)			55
Total, Ending Balance	(475)		(475)
Pension and other postretirement benefits [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]
Amortization of prior service cost (credit) included in net periodic benefit cost			(2)
Amortization of actuarial (gain) loss included in net periodic benefit cost			47
Reclassifications before income tax			$ 45