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Equity-Based Compensation - Schedule of Equity-Based Compensation Expense Recognized in Consolidated Financial Statements (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Equity-based compensation expense | $ 6 | $ 2 | $ 6 |
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REUs [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Equity-based compensation expense | 1 | 1 | 1 |
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Restricted Share Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Equity-based compensation expense | 5 | 1 | 5 |
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Stock Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Equity-based compensation expense | |||