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Discontinued Operations Discontinued Operations Additional Information (Details) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income from discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  | $ 9,000,000 | $ 84,000,000 | $ 70,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  | (43,000,000) | (1,600,000,000) | 749,000,000
Restructuring Charges |  |  |  |  |  |  | 367,000,000 | 288,000,000 | 215,000,000
Net actuarial (gain) loss |  |  |  |  |  |  | $ 420,000,000 | (393,000,000) | (416,000,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  | 35.00% |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  | $ 705,000,000 | 197,000,000 | 71,000,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 53,000,000 |  |  |  |  |  | 34,000,000 | (29,000,000) | (7,000,000)
Deferred income taxes |  |  |  |  |  |  | 563,000,000 | (765,000,000) | 242,000,000
Adient |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net Sales, Discontinued Operations |  |  |  |  |  |  | 1,434,000,000 | 16,837,000,000 | 20,079,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  | 1,000,000 | 525,000,000 | 1,220,000,000
Provision for income taxes on discontinued operations |  |  |  |  |  |  | 35,000,000 | 2,041,000,000 | 529,000,000
Income from discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  | 9,000,000 | 84,000,000 | 66,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  | (43,000,000) | (1,600,000,000) | 625,000,000
Separation costs |  |  |  |  |  |  | 79,000,000 | 418,000,000 |
Restructuring Charges |  |  |  |  |  |  |  | 332,000,000 | 182,000,000
Net actuarial (gain) loss |  |  |  |  |  |  |  | 110,000,000 | 6,000,000
Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | 155,000,000
Transaction and separation costs |  |  |  |  |  |  |  |  | 52,000,000
Income Tax Expense (Benefit) |  |  |  |  |  |  |  | 95,000,000 |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | $ 85,000,000 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | $ 780,000,000 |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  | 24,000,000 |
Global Workplace Solutions |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net Sales, Discontinued Operations |  |  |  |  |  |  |  |  | 3,025,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | 1,203,000,000
Provision for income taxes on discontinued operations |  |  |  |  |  |  |  |  | 1,075,000,000
Income from discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 4,000,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  | $ 0 |  | 124,000,000
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  |  |  |  | 680,000,000
Transaction costs, divestiture related |  |  |  |  |  |  |  |  | 87,000,000
Automotive Experience Interiors | Yanfeng Automotive Trim Systems [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  | $ 145,000,000 |  |  |  |  |
Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  | 145,000,000 |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  | 38,000,000 |  |  |  |  |
Automotive Experience Interiors | Interiors |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  | 223,000,000 | $ 75,000,000 |  |  |  |
Global Workplace Solutions | Brookfield Johnson Controls [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  | $ 200,000,000 |  |  |
Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | 200,000,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  | $ 127,000,000 |  |  |
Discontinued Operation, Tax Effect of Gain from Disposal of Discontinued Operation |  |  |  |  |  |  |  |  | 73,000,000
Number of Joint Ventures Divested |  |  |  |  |  | 2 |  |  |
Global Workplace Solutions | CBRE Group, Inc. [Member] [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  | 940,000,000 |  |  |  |  |
Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  | 940,000,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  | $ 643,000,000 |  |  |  |  |
Ongoing Strategic Relationship With Buyer in Divestiture of Business |  |  |  |  |  | 10 years |  |  |
Discontinued Operation, Tax Effect of Gain from Disposal of Discontinued Operation |  |  |  |  |  |  |  |  | $ 297,000,000
Substantial business reorganizations [Member] | Adient |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  |  |  |  |  |  | $ 1,891,000,000 |

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