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Significant Restructuring Costs Change in Restructuring Reserve - 2021 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs | $ 79 |  | $ 610 | $ 62 | $ 175 | $ 783
2021 Restructuring Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and Related Cost, Total Expected Cost | 385 |  |  |  | 385 |
Restructuring and impairment costs | 79 | $ 96 |  |  | 175 |
Payments for Restructuring | (18) | (5) |  |  |  |
Restructuring Reserve, Settled without Cash | (40) | (54) |  |  |  |
Restructuring Reserve | 58 | 37 |  |  | 58 |
2021 Restructuring Plan | Employee Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs | 10 | 32 |  |  |  |
Payments for Restructuring | (7) | (2) |  |  |  |
Restructuring Reserve, Settled without Cash | 0 | 0 |  |  |  |
Restructuring Reserve | 33 | 30 |  |  | 33 |
2021 Restructuring Plan | Long-Lived Asset Impairment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs | 40 | 54 |  |  |  |
Payments for Restructuring | 0 | 0 |  |  |  |
Restructuring Reserve, Settled without Cash | (40) | (54) |  |  |  |
Restructuring Reserve | 0 | 0 |  |  | 0 |
2021 Restructuring Plan | Other Restructuring |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs | 29 | 10 |  |  |  |
Payments for Restructuring | (11) | (3) |  |  |  |
Restructuring Reserve, Settled without Cash | 0 | 0 |  |  |  |
Restructuring Reserve | $ 25 | $ 7 |  |  | 25 |
2021 Restructuring Plan | Global Products |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 77 |
2021 Restructuring Plan | Building Solutions North America |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 44 |
2021 Restructuring Plan | Building Solutions EMEA/LA |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 20 |
2021 Restructuring Plan | Corporate Segment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | 19 |
2021 Restructuring Plan | Building Solutions Asia Pacific |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  | $ 15 |

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