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Earnings (Loss) Per Common Share - Schedule of Earnings (Loss) Per Common Share (Parenthetical) (Detail) (Securities [Member]) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Securities [Member]
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Stock awards not included in the computation of diluted earnings per share	12	16	15

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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