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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate reconciliation, percent | 22.00% |  | 32.00% | 27.00% | 30.00%
Tax benefit related to a deduction for U.S. domestic production activities |  |  |  | $ 218 |
Tax benefit related to a deduction for U.S. domestic production activities, from prior periods |  | 17 |  | 184 |
Tax benefit recognized related to CA apportionment rules |  |  | (76) |  |
Unrecognized tax benefits, period increase (decrease) | 133 |  |  | 180 |
Unrecognized tax benefits that would impact effective tax rate, period increase (decrease) | 132 |  |  | 177 |
Unrecognized tax benefits, increase resulting from interest accrued | 2 |  |  | 4 |
Unrecognized tax benefits, penalties on income taxes released | $ 1 |  |  |  |

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- 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 -SubTopic 10 -Section 50 -Paragraph 13 -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The net amount of all increases and decreases in unrecognized tax benefits for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity from Prior Periods, Amount + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The Increase (Decrease) In the total amount of unrecognized tax benefits that, if regognized, would affect the effective tax rate. + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Increase Resulting from Interest Accrued + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Penalties On Income Taxes Released + References No definition available. + Details
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