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Stock-Based Compensation - Phantom Stock Awards and Stock Appreciation Rights (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Phantom Stock Awards [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Accrued compensation cost liability | $ 11 | $ 7
Unrecognized compensation cost | 5 | 4
Equivalent common shares | 1 | 1
Stock Appreciation Rights [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Accrued compensation cost liability | 6 | 3
Unrecognized compensation cost | $ 1 | $ 1
Equivalent common shares | 2 | 2

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Equivalent Common Shares + References No definition available. + Details
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