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Fair Value of Financial Investments - Additional Information (Detail) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Aggregate carrying value of remaining private equity funds | $ 69,000,000 |
Estimated market value of long-term and short-term debt | 3,900,000,000 | 4,000,000,000
Aggregate carrying value of long-term and short-term debt | $ 3,600,000,000 | $ 4,000,000,000

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- Definition Aggregate carrying value of remaining private equity funds. + References No definition available. + Details
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- Definition Estimated market value of long term and short term debt. + References No definition available. + Details
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