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Equity and Noncontrolling Interests Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, end of period |  | $ (946) | $ (473) | $ (1,153) |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |
Current period changes in fair value |  | (29) | (14) | 9 |
Reclassification to income, tax |  | (1) | 0 |  |
Pension and postretirement plans |  |  |  |  |
Stock repurchase program, authorized amount |  | 1,000 |  |  | $ 1,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | (1) | 0 | 0 |
Proceeds from Sale and Maturity of Marketable Securities |  | 3 |  |  |
Marketable Securities, Realized Gain (Loss) |  | 2 |  |  |
Foreign Currency Translation |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |
Balance at beginning of period |  | (481) | (1,152) | (1,047) |
Aggregate adjustment for the period | [1] | (458) | 108 | (105) |
Balance at end of period |  | (939) | (481) | (1,152) |
Aggregate adjustment for the period, tax |  | (3) | 1 | (43) |
Pension and postretirement plans |  |  |  |  |
Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Adient spin-off |  | 0 | 563 | 0 |
Realized And Unrealized Gains Losses On Derivatives |  |  |  |  |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |
Balance at beginning of period |  | 6 | 4 | (7) |
Current period changes in fair value |  | (8) | 9 | (10) |
Reclassification to income | [2] | (11) | (23) | 21 |
Adient spin-off impact |  | 0 | 16 | 0 |
Balance at end of period |  | (13) | 6 | 4 |
Current period changes in fair value, tax |  | (4) | 4 | (5) |
Reclassification to income, tax |  | (5) | (10) | 11 |
Other Comprehensive Income, Unrealized Gain on Derivatives Arising Due to Adient spin-off, Tax |  | 0 | 6 |  |
Unrealized Gain Loss On Marketable Securities |  |  |  |  |
Realize and unrealized gains (losses) on marketable securities |  |  |  |  |
Balance at beginning of period |  | 4 | (1) | 0 |
Current period changes in fair value |  | 5 | 5 | (1) |
Balance at end of period |  | 8 | 4 | (1) |
Current period changes in fair value, tax |  | 1 | 1 | 0 |
Pension And Other Postretirement Benefit Plans Assets |  |  |  |  |
Pension and postretirement plans |  |  |  |  |
Balance at beginning of period |  | (2) | (4) | (3) |
Reclassification to income | [3] | 0 | 0 | (1) |
Adient spin-off impact |  | 0 | 2 | 0 |
Balance at end of period |  | (2) | (2) | (4) |
Reclassification to income, tax |  | 0 | 0 | 0 |
Adient spin-off, tax |  | 0 | 0 | $ 0 |
Other Comprehensive Income, Pension and Other Postretirement Benefit Plan, Tax, due to Adient spin-off |  |  | $ 0 |  |
Scott Safety business [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  | $ 12 |  |  |
[1] | {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmNkYmRiMTQwN2NmNzQyMWFiMTk2ODVmODAzOTk1MTMxfFRleHRTZWxlY3Rpb246OTI2N0UxOEE4REFFNDc4M0NBREQ4MTQxQzEyNEQ3MUQM}
[2] | Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items on the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives.
[3] | Refer to Note 15, "Retirement Plans," of the notes to consolidated financial statements for disclosure of the components of the Company's net periodic benefit costs associated with its defined benefit pension and postretirement plans. For the year ended September 30, 2016 the amounts reclassified from AOCI into income for pension and postretirement plans were primarily recorded in selling, general and administrative expenses on the consolidated statements of income.

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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