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Fair Value of Financial Investments and Liabilities - Income from Financial Investments, Net, Included in Other, Net, within Other Income (Expense), Net, and Impairment Charges for Financial Investments (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Asahi Tec [Member] | 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]
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Realized gains from marketable securities |  | $ 41 | $ 10 |  |  |  |  |
Realized losses from marketable securities |  |  | (8) |  |  |  |  |
Income from other investments, net | 24 | 32 | 7 |  |  |  |  |
Income from financial investments, net | 24 | 73 | 9 |  |  |  |  |
Impairment charges: |  |  |  |  |  |  |  |
Total impairment charges | $ (2) |  | $ (34) | $ (28) | $ (2) | $ (2) | $ (4) | $ (2)

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