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Income Taxes (Income (Loss) From Operations Before Provision (Benefit) For Income Tax) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income (Loss) From Operations Before Provision (Benefit) For Income Taxes [Line Items] |  |  |
Income (loss) from operations before provision (benefit) for income taxes | $ 1,598 | $ (2,239) | $ (95)
Domestic [Member] |  |  |
Income (Loss) From Operations Before Provision (Benefit) For Income Taxes [Line Items] |  |  |
Income (loss) from operations before provision (benefit) for income taxes | 1,486 | (2,231) | (146)
Foreign [Member] |  |  |
Income (Loss) From Operations Before Provision (Benefit) For Income Taxes [Line Items] |  |  |
Income (loss) from operations before provision (benefit) for income taxes | $ 112 | $ (8) | $ 51

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 + Details
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