Discontinued Operations And Held For Sale Businesses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
(Gain) loss on disposal and impairment write-down - discontinued operations			$ 130	$ (1)
Discontinued Operations Income Loss
Revenue	1	181	48	546
Income (loss) from operations of discontinued businesses	1	(44)	3	(66)
Income tax (expense) benefit	2	16	(3)	22
Income (loss) from operations of discontinued businesses	3	(28)	0	(44)
Net gain/(loss) on sale and impairments of discontinued operations, net of tax	(2)	0	68	0
Red Oak [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Divestiture Of Ownership In Subsidiary Percent	100.00%		100.00%
Sales proceeds, plants			143
(Gain) loss on disposal and impairment write-down - discontinued operations			65
Ironwood [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Divestiture Of Ownership In Subsidiary Percent	100.00%		100.00%
Sales proceeds, plants			84
(Gain) loss on disposal and impairment write-down - discontinued operations			$ 71