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Benefit Obligation and Fair Value of Plan Assets with Obligations in Excess of Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation, end of year	$ (39)	$ (839)
Fair value of plan assets, end of year	0	783
Projected benefit obligation in excess of plan assets
Benefit obligation, end of year	(40)	(839)
Fair value of plan assets, end of year	$ 0	$ 783

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details