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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 |

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