Benefit Obligation and Fair Value of Plan Assets with Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions |
Sep. 30, 2015 |
Sep. 30, 2014 |
|---|---|---|
| Accumulated benefit obligation in excess of plan assets | ||
| Accumulated benefit obligation, end of year | $ (19) | $ (30) |
| Fair value of plan assets, end of year | 0 | 0 |
| Projected benefit obligation in excess of plan assets | ||
| Benefit obligation, end of year | (19) | (30) |
| Fair value of plan assets, end of year | $ 0 | $ 0 |
| X | ||||||||||
- References No definition available.
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Defined Benefit Plan, Pension Plans With Projected Benefit Obligations In Excess Of Plan Assets [Abstract] No definition available.
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