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Benefit Obligations in Excess of Plan Assets Related to the Company's U.S. Non-Qualified Plan and the Non-U.S. Pension Plans (Detail) - Pension Benefits - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
U.S. Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Accumulated benefit obligation—end of year | $ (7) | $ (16)
Fair value of plan assets—end of year | 0 | 0
Projected benefit obligation in excess of plan assets |  |
Benefit obligation—end of year | (7) | (16)
Fair value of plan assets—end of year | 0 | 0
Non-U.S. Plans |  |
Accumulated benefit obligation in excess of plan assets |  |
Accumulated benefit obligation—end of year | (5) | (474)
Fair value of plan assets—end of year | 0 | 415
Projected benefit obligation in excess of plan assets |  |
Benefit obligation—end of year | (5) | (474)
Fair value of plan assets—end of year | $ 0 | $ 415

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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Amount of benefit obligation for defined benefit plan with benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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