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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Abstract]
Effective Income Tax Rate, Continuing Operations	29.00%	35.00%	22.00%	36.00%
Income Tax Impact From Remeasurement Of Deferred Taxes	$ 208
Unrecognized Tax Benefits, Period Increase (Decrease)	195		246
Unrecognized Tax Benefits, Change in Interest on Income Taxes Accrued	1		15
Estimated Income Tax Owed	$ 396		$ 396

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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