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Outstanding Awards Expected to Vest (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2013
Stock Option and Stock Appreciation Rights [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity awards outstanding that are vested and expected to vest 3.0
Aggregate vested and expected to vest intrinsic value $ 17
Vested and expected to vest weighted-average exercise price $ 14.05
Vested and expected to vest weighted-average remaining contractual life 7 years 8 months 12 days
Equity awards outstanding that are exercisable or convertible 1.3
Aggregate exercisable or convertible intrinsic value 11
Exercisable or convertible weighted-average exercise price $ 11.13
Exercisable or convertible weighted-average remaining contractual life 6 years 6 months
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity awards outstanding that are vested and expected to vest 1.4
Aggregate vested and expected to vest intrinsic value 27
Vested and expected to vest weighted-average remaining contractual life 1 year 2 months 12 days
Equity awards outstanding that are exercisable or convertible 0.1
Aggregate exercisable or convertible intrinsic value $ 1
Exercisable or convertible weighted-average remaining contractual life 1 month 6 days