Discontinued Operations And Held For Sale Businesses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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			$ 131	$ 0
Discontinued Operations Income Loss
Revenue	10	168	47	365
Income (loss) from operations of discontinued businesses	(1)	(12)	2	(22)
Income tax (expense) benefit	(3)	3	(5)	6
Income (loss) from operations of discontinued businesses	(4)	(9)	(3)	(16)
Net gain/(loss) on sale and impairments of discontinued operations, net of tax	75	0	70	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