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Earnings (Loss) Per Share (Parenthetical) (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Earnings Per Share Disclosure [Line Items]    
Weighted-average diluted common shares outstanding, antidilutive securities (stock options, RSUs and SARs) 5.4 6.4
Weighted-average number of diluted shares if not in a loss position 502.0 502.8