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Numerators and Denominators Used in Computations of Basic and Diluted Earnings per Common Share (Detail) (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 from continuing operations | $ 22 | $ 56 | $ 3 | $ 29
Income from continuing operations attributable to common shareholders | 21 | 54 | 1 | 27
Loss from discontinued operations | (7) | (20) | (30) | (31)
Loss from discontinued operations attributable to common shareholders | (7) | (19) | (29) | (30)
Net income (loss) available to common shareholders | 14 | 35 | (28) | (3)
Basic common shares (based upon weighted average) | 349 | 348 | 349 | 348
Contingent common shares |  |  |  |
Stock option dilution | 1 |  | 1 | 1
Diluted common shares | 350 | 348 | 350 | 349
Segment, Continuing Operations [Member] |  |  |  |
Allocation to unvested restricted stock awards | (1) | (2) | (2) | (2)
Segment, Discontinued Operations [Member] |  |  |  |
Allocation to unvested restricted stock awards |  | $ 1 | $ 1 | $ 1

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- Definition Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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