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Goodwill and Identifiable Intangible Assets - Summarize of Identifiable Intangible Assets with Definite and Indefinite Useful Lives (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Pre-tax impairment charge of indefinite lived intangible assets |  | $ 189
Trademarks and trade names [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Pre-tax impairment charge of indefinite lived intangible assets | 441 | 189
Impairment recorded | 779 |
In Process Research and Development [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Impairment recorded | 22 |
Impairment recorded, net of taxes | $ 14 |

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- Definition Impairment Of Goodwill And Other Intangible Assets Net Of Tax + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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