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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, percent	33.00%	33.00%	29.00%	31.00%
Tax benefit related to a deduction for U.S. domestic production activities			$ 245
Tax benefit related to a deduction for U.S. domestic production activities, from prior periods			189
Tax benefit recognized related to CA apportionment rules		(76)
Unrecognized tax benefits, period increase (decrease)	43		223
Unrecognized tax benefits that would impact effective tax rate, period increase (decrease)	42		219
Unrecognized tax benefits, increase resulting from interest accrued	4		8
Unrecognized tax benefits, penalties on income taxes released	$ 1		$ 2

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 2

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



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- Definition

The net amount of all increases and decreases in unrecognized tax benefits for the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 15A

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Tax benefit recognized in the period as result of new guidance issued by the State of California regarding apportionment rules for years prior to fiscal 2012.

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The Increase (Decrease) In the total amount of unrecognized tax benefits that, if regognized, would affect the effective tax rate.

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Unrecognized Tax Benefits, Increase Resulting from Interest Accrued

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Unrecognized Tax Benefits, Penalties On Income Taxes Released

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