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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 62 |  |  |  |
Restructuring and impairment costs | 62 |  | $ 0 | $ 173 | $ 0
2020 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | $ 111 |  |  |
Payments for Restructuring | (25) | (8) |  |  |
Restructuring Reserve, Settled without Cash |  | (54) |  |  |
Restructuring Reserve | 24 | 49 |  | 24 |
Employee Severance | 2020 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 54 |  |  |
Payments for Restructuring | (24) | (8) |  |  |
Restructuring Reserve, Settled without Cash |  | 0 |  |  |
Restructuring Reserve | 22 | 46 |  | 22 |
Long-Lived Asset Impairment | 2020 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 54 |  |  |
Payments for Restructuring | 0 | 0 |  |  |
Restructuring Reserve, Settled without Cash |  | (54) |  |  |
Restructuring Reserve | 0 | 0 |  | 0 |
Other Restructuring | 2020 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 3 |  |  |
Payments for Restructuring | (1) | 0 |  |  |
Restructuring Reserve, Settled without Cash |  | 0 |  |  |
Restructuring Reserve | $ 2 | 3 |  | $ 2 |
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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