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Significant Restructuring Costs Change in Restructuring Reserve - 2018 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs | $ 0 | $ 158 | $ 99 | $ 78 | $ 158 | $ 177
2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  | 158 |  |  | 158 |
Restructuring Reserve, Settled without Cash |  | (30) |  |  |  |
Restructuring Reserve | 119 | 128 |  |  | 119 |
Payments for Restructuring | (9) |  |  |  |  |
Employee Severance | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  | 125 |  |  |  |
Restructuring Reserve, Settled without Cash |  | 0 |  |  |  |
Restructuring Reserve | 117 | 125 |  |  | 117 |
Payments for Restructuring | (8) |  |  |  |  |
Fixed Asset Impairment | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  | 30 |  |  |  |
Restructuring Reserve, Settled without Cash |  | (30) |  |  |  |
Restructuring Reserve | 0 | 0 |  |  | 0 |
Payments for Restructuring | 0 |  |  |  |  |
Other Restructuring | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  | 3 |  |  |  |
Restructuring Reserve, Settled without Cash |  | 0 |  |  |  |
Restructuring Reserve | 2 | $ 3 |  |  | 2 |
Payments for Restructuring | $ (1) |  |  |  |  |
Global Products | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 76 |
Building Solutions EMEA/LA | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 32 |
Corporate Segment | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 24 |
Building Solutions Asia Pacific | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 14 |
Building Solutions North America | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 8 |
Power Solutions | 2018 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | $ 4 |

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