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Fair Value of Financial Investments - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 Funds Venture | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 31, 2012 Private Equity Funds [Member] | Dec. 31, 2012 Private Equity Funds [Member] | Dec. 31, 2010 Private Equity Funds [Member] | Dec. 31, 2010 Other private investments [Member]
Investment Holdings [Line Items] |  |  |  |  |  |  |
Number of venture capital fund | 15 |  |  |  |  |  |
Venture capital fund, aggregate carrying value | $ 16,000,000 |  |  |  |  |  |
Number of buyout fund | 21 |  |  |  |  |  |
Buy out fund, aggregate carrying value | 53,000,000 | 67,000,000 |  |  |  |  |
Auction rate securities interest rates reset periods | 7, 28 or 35 days |  |  |  |  |  |
Sale of financial investments, shares |  | 1,974,000 |  |  |  |  |
Sale of financial investments |  | 43,000,000 |  |  |  |  |
Carrying value of financial asset |  |  |  | 4,000,000 |  | 6,000,000 |
Impairment charges for financial investments | 2,000,000 |  | 34,000,000 | 2,000,000 | 2,000,000 | 4,000,000 | 2,000,000
Impairment loss based on the current fair value of the preferred stock |  |  | 28,000,000 |  |  |  |
Cash proceeds from marketable securities |  |  | 11,000,000 |  |  |  |
Realized losses from marketable securities |  |  | 8,000,000 |  |  |  |
Tax Refund Receivable in next year relating to sale of marketable securities |  | 16,000,000 |  |  |  |  |
Estimated market value of long-term and short-term debt | 4,000,000,000 | 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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