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Plan's Investments at Fair Value (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value, assets, level 1 to level 2 transfers, amount |  | $ 0 |  |
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value, assets, level 1 to level 2 transfers, amount |  | 0 | $ 0 |
U.S. Plans | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1,074 | 1,077 | $ 1,022
U.S. Plans | Fixed income securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Actual plan asset allocations |  | 33.00% |  |
U.S. Plans | Other security investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Actual plan asset allocations |  | 3.00% |  |
U.S. Plans | Equity securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Actual plan asset allocations |  | 64.00% |  |
U.S. Plans | Fair Value, Measurements, Recurring | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1,074 | 1,077 |
U.S. Plans | Fair Value, Measurements, Recurring | Cash equivalents | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 31 | 39 |
U.S. Plans | Fair Value, Measurements, Recurring | Collective investment funds | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 540 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Corporate debt securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 197 | 185 |
U.S. Plans | Fair Value, Measurements, Recurring | U.S. government-sponsored debt securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 47 | 30 |
U.S. Plans | Fair Value, Measurements, Recurring | U.S. Treasury securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 75 | 100 |
U.S. Plans | Fair Value, Measurements, Recurring | Asset-backed securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 39 | 51 |
U.S. Plans | Fair Value, Measurements, Recurring | Equity securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 145 | 672 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 251 | 811 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 31 | 39 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 75 | 100 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Equity securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 145 | 672 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 784 | 215 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Collective investment funds | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 540 | 0 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 197 | 185 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored debt securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 47 | 30 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 39 | 51 |
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 39 | 51 |
Non-U.S. Plans | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | $ 433 | 415 | $ 0
Non-U.S. Plans | Fixed income securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 47.00% |  |
Actual plan asset allocations |  | 44.00% |  |
Non-U.S. Plans | Other security investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 25.00% |  |
Actual plan asset allocations |  | 25.00% |  |
Non-U.S. Plans | Equity securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 28.00% |  |
Actual plan asset allocations |  | 31.00% |  |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | $ 433 | 415 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Cash equivalents | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 1 | 105 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Corporate debt securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 39 | 39 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | UK Treasury securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 150 | 52 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Asset-backed securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 32 | 29 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Equity securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 134 | 116 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Multi-asset securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets | [1] | 77 | 74 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 285 | 273 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 1 | 105 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | UK Treasury securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 150 | 52 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Equity securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 134 | 116 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 116 | 113 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 39 | 39 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Multi-asset securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets | [1] | 77 | 74 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | 32 | 29 |
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities | Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Fair value of plan assets |  | $ 32 | $ 29 |
Minimum | U.S. Plans | Fixed income securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 25.00% |  |
Minimum | U.S. Plans | Equity securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 50.00% |  |
Maximum | U.S. Plans | Fixed income securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 35.00% |  |
Maximum | U.S. Plans | Other security investments |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 7.00% |  |
Maximum | U.S. Plans | Equity securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  | 80.00% |  |
[1] | Multi-asset securities represent pension plan assets that are invested in funds comprised of broad ranges of assets.

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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