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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | $ 111 | $ 0
2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 111 |
Payments for Restructuring | (8) |
Restructuring Reserve, Settled without Cash | (54) |
Restructuring Reserve | 49 |
Employee Severance | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 54 |
Payments for Restructuring | (8) |
Restructuring Reserve, Settled without Cash | 0 |
Restructuring Reserve | 46 |
Fixed Asset Impairment | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 54 |
Payments for Restructuring | 0 |
Restructuring Reserve, Settled without Cash | (54) |
Restructuring Reserve | 0 |
Other Restructuring | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 3 |
Payments for Restructuring | 0 |
Restructuring Reserve, Settled without Cash | 0 |
Restructuring Reserve | 3 |
Global Products | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 87 |
Building Solutions Asia Pacific | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 10 |
Building Solutions EMEA/LA | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 6 |
Building Solutions North America | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | 8 |
Continuing Operations | 2020 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring and impairment costs | $ 111 |

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