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Significant Restructuring Costs Change in Restructuring Reserve - 2017 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs | $ 62 | $ 0 | $ 173 | $ 0 |  |  |
2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 367
Payments for Restructuring |  |  | (25) |  | $ (13) | $ (158) | (75)
Restructuring Reserve, Settled without Cash |  |  |  |  | (3) | (1) | (78)
Adjustment to restructuring reserves |  |  |  |  |  |  | 25
Restructuring Reserve | 31 |  | 31 |  | 61 | 80 | 239
Employee Severance | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 276
Payments for Restructuring |  |  | (25) |  | (11) | (152) | (75)
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 | 0 | 0
Adjustment to restructuring reserves |  |  |  |  |  |  | 25
Restructuring Reserve | 35 |  | 35 |  | 60 | 74 | 226
Long-Lived Asset Impairment | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 77
Payments for Restructuring |  |  | 0 |  | 0 | 0 | 0
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 | 0 | (77)
Adjustment to restructuring reserves |  |  |  |  |  |  | 0
Restructuring Reserve | 0 |  | 0 |  | 0 | 0 | 0
Other Restructuring | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 14
Payments for Restructuring |  |  | 0 |  | (2) | (6) | 0
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 | 0 | (1)
Adjustment to restructuring reserves |  |  |  |  |  |  | 0
Restructuring Reserve | 0 |  | 0 |  | 5 | 7 | 13
Currency Translation | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 0
Payments for Restructuring |  |  | 0 |  | 0 | 0 | 0
Restructuring Reserve, Settled without Cash |  |  |  |  | (3) | (1) | 0
Adjustment to restructuring reserves |  |  |  |  |  |  | 0
Restructuring Reserve | $ (4) |  | (4) |  | (4) | $ (1) | 0
Corporate Segment | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 166
Building Technologies & Solutions EMEA LA [Member] | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 74
Building Solutions North America | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 59
Building Solutions Asia Pacific | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 16
Global Products | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 32
Continuing Operations | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 347
Power Solutions | Transfer To Held for Sale [Member] | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  | (3) |  |
Power Solutions | Transfer To Held for Sale [Member] | Employee Severance | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  | (3) |  |
Power Solutions | Transfer To Held for Sale [Member] | Long-Lived Asset Impairment | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 |  |
Power Solutions | Transfer To Held for Sale [Member] | Other Restructuring | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 |  |
Power Solutions | Transfer To Held for Sale [Member] | Currency Translation | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Settled without Cash |  |  |  |  | $ 0 |  |
Power Solutions | Discontinued Operations | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 20
Accounting Standards Update 2016-02 [Member] | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Translation and Other Adjustment |  |  | (5) |  |  |  |
Accounting Standards Update 2016-02 [Member] | Employee Severance | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Translation and Other Adjustment |  |  | 0 |  |  |  |
Accounting Standards Update 2016-02 [Member] | Long-Lived Asset Impairment | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Translation and Other Adjustment |  |  | 0 |  |  |  |
Accounting Standards Update 2016-02 [Member] | Other Restructuring | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Translation and Other Adjustment |  |  | (5) |  |  |  |
Accounting Standards Update 2016-02 [Member] | Currency Translation | 2017 Restructuring Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring Reserve, Translation and Other Adjustment |  |  | $ 0 |  |  |  |

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