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Discontinued Operations Discontinued Operations, Income Statement Disclosures - (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income from discontinued operations attributable to noncontrolling interests |  |  | $ 24 | $ 47 | $ 51
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  | 4,574 | 987 | 939
Restructuring and impairment costs |  |  | $ 235 | $ 255 | $ 347
Ireland statutory rate |  |  | 12.50% | 12.50% | 12.50%
Income Tax Expense (Benefit) |  |  | $ (233) | $ 197 | $ 322
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | $ (76) | (284) | 31 | (164)
Deferred income taxes |  |  | $ 612 | (739) | 573
Document Period End Date |  |  | Sep. 30, 2019 |  |
Power Solutions |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 13,200 |  |  |  |
Disposal Group, Discontinued Operations, Consideration, net | 11,600 |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | $ 5,200 |  | $ 5,200 |  |
Depreciation and Amortization, Discontinued Operations |  |  | 117 |  |
Adient |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net Sales, Discontinued Operations |  |  |  |  | 1,434
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  | 1
Provision for income taxes on discontinued operations |  |  |  |  | (35)
Income from discontinued operations attributable to noncontrolling interests |  |  |  |  | (9)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  |  | (43)
Separation costs |  |  |  |  | 79
Discontinued Operations, Disposed of by Sale [Member] | Power Solutions |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net Sales, Discontinued Operations |  |  | 5,001 | 8,000 | 7,337
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  | 6,039 | 1,355 | 1,407
Provision for income taxes on discontinued operations |  |  | (1,441) | (321) | (383)
Income from discontinued operations attributable to noncontrolling interests |  |  | (24) | (47) | (42)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  | $ 4,574 | $ 987 | $ 982

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