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Financial Instruments Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) (USD $)
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Dec. 31, 2011
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Dec. 31, 2010
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Fair value of long-term debt | $ 40,100,000,000 | $ 42,300,000,000 | ||||||||||
| Short-term borrowings, carried at historical proceeds, as adjusted | 4,018,000,000 | [1],[2] | 5,603,000,000 | [1],[2] | ||||||||
| Long-term debt, carried at historical proceeds, as adjusted | 34,931,000,000 | [3],[4] | 38,410,000,000 | [3],[4] | ||||||||
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Wyeth [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Money market funds held in escrow | 625,000,000 | 625,000,000 | ||||||||||
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Interest rate swaps [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Instruments used as offsets (assets) | 8,000,000 | |||||||||||
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Foreign currency forward-exchange contracts [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Instruments used as offsets (assets) | 169,000,000 | 326,000,000 | ||||||||||
| Instruments used as offsets (liabilities) | 141,000,000 | 186,000,000 | ||||||||||
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Foreign Exchange Contract [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Instruments used as offsets (assets) | 17,000,000 | |||||||||||
| Instruments used as offsets (liabilities) | 123,000,000 | 93,000,000 | ||||||||||
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Fair value inputs Level 1 [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Available for sale equity securities, excluding money market funds | 85,000,000 | 105,000,000 | ||||||||||
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Fair value inputs Level 3 [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Available for sale equity securities, excluding money market funds | 25,000,000 | |||||||||||
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Foreign Currency Borrowings Designated As Hedging Instruments Short Term Liability At Fair Value [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Short-term borrowings, carried at historical proceeds, as adjusted | 2,000,000,000 | |||||||||||
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Foreign Currency Debt Designated As Hedging Instruments Long Term Liability At Fair Value [Member]
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| Footnotes to selected financial assets and liabilities: | ||||||||||||
| Long-term debt, carried at historical proceeds, as adjusted | $ 919,000,000 | $ 880,000,000 | ||||||||||
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