Dispositions and Other Income - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	1 Months Ended
Jun. 30, 2012	Dec. 03, 2010 Miramax
Significant Acquisitions and Disposals [Line Items]
Proceeds from dispositions		$ 663
Net proceeds from dispositions after adjustments		532
Pre-tax gain from dispositions		64
Goodwill associated with dispositions	4	217
After-tax (loss) from dispositions		(39)
Tax expense in connection with dispositions		$ 103

Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.

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