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Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive effect on computation of diluted earnings per common share	15,000,000	30,000,000
Grant of long term stock awards	1,000,000	1,000,000
Repurchase and retirement of common stock to offset the dilutive impact of long term stock awards	1,700,000
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect	$ 35
Common stock outstanding under repurchase authorization	22,600,000
Cash dividends per common share paid	$ 0.075	$ 0.075
Cash dividends per common share declared	$ 0.075	$ 0.075
Long-Term Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Grant of long term stock awards	1,600,000

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