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Significant Restructuring Costs Change in Restructuring Reserve - 2020 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs | $ 79 | $ 610 | $ 62 |  | $ 175 | $ 783 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  |  | $ 62
Building Solutions North America Retail [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | 424
2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  | $ 610 |  | $ 111 |  |  | 297
Payments for Restructuring |  |  |  |  | (64) |  | (95)
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (96)
Currency Translation |  |  |  |  | 1 |  | 2
Restructuring Reserve | 45 |  |  |  | 45 |  | 108
Employee Severance | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 196
Payments for Restructuring |  |  |  |  | (62) |  | (92)
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0
Currency Translation |  |  |  |  | 1 |  | 2
Restructuring Reserve | 45 |  |  |  | 45 |  | 106
Long-Lived Asset Impairment | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 96
Payments for Restructuring |  |  |  |  | 0 |  | 0
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | (96)
Currency Translation |  |  |  |  | 0 |  | 0
Restructuring Reserve | 0 |  |  |  | 0 |  | 0
Other Restructuring | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 5
Payments for Restructuring |  |  |  |  | (2) |  | (3)
Restructuring Reserve, Settled without Cash |  |  |  |  |  |  | 0
Currency Translation |  |  |  |  | 0 |  | 0
Restructuring Reserve | $ 0 |  |  |  | $ 0 |  | 2
Global Products | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 136
Building Solutions North America | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 64
Building Solutions Asia Pacific | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 49
Building Solutions EMEA/LA | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 43
Corporate Segment | 2020 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 5

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