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Earning Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive effect on computation of diluted earnings per common share | 29,000,000 | 37,000,000 | 29,000,000 | 37,000,000
Grant of long term stock awards |  |  | 1,000,000 | 2,000,000
Repurchase and retirement of common stock to offset the dilutive impact of long term stock awards |  |  | 675,110 |
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect |  |  | $ 8 |
Common stock outstanding under repurchase authorization | 24,000,000 |  | 24,000,000 |
Cash dividends per common share paid | $ 0.075 | $ 0.075 | $ 0.225 | $ 0.225
Cash dividends per common share declared | $ 0.075 | $ 0.075 | $ 0.225 | $ 0.225
Long term stock awards |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Grant of long term stock awards |  |  | 819,520 |

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