Reconciliation of Beginning and Ending Unrecognized Tax Benefits by Fiscal Year (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
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Sep. 30, 2013
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Sep. 30, 2012
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Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
Beginning Balance | $ 679 | $ 850 |
Increases of unrecognized tax benefits related to prior years | 335 | 186 |
Decreases of unrecognized tax benefits related to prior years | (133) | (445) |
Increases of unrecognized tax benefits related to current year | 144 | 89 |
Reductions to unrecognized tax benefits related to lapsing statute of limitations | (2) | (1) |
Ending Balance | $ 1,023 | $ 679 |
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- Details
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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X | ||||||||||
- Definition
Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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