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Guarantor and Non-Guarantor Financial Statements - Consolidating Condensed Statements of Cash Flows (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2011
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| Condensed Financial Information Of Parent Company Only Disclosure [Abstract] | |
| Net of cash disposed in proceeds from sale of business | $ 7 |