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Significant Restructuring Costs Change in Restructuring Reserve - 2018 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | $ 111 | $ 0 |  |
2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | $ 263
Payments for Restructuring | (5) |  | $ (67) | (47)
Restructuring Reserve, Settled without Cash | 2 |  | (1) | (42)
Restructuring Reserve | 95 |  | 102 | 174
Employee Severance | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 209
Payments for Restructuring | (5) |  | (61) | (45)
Restructuring Reserve, Settled without Cash | 0 |  | 0 | 0
Restructuring Reserve | 94 |  | 99 | 164
Fixed Asset Impairment | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 42
Payments for Restructuring | 0 |  | 0 | 0
Restructuring Reserve, Settled without Cash | 0 |  | 0 | (42)
Restructuring Reserve | 0 |  | 0 | 0
Other Restructuring | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 12
Payments for Restructuring | 0 |  | (6) | (2)
Restructuring Reserve, Settled without Cash | 0 |  | 0 | 0
Restructuring Reserve | 0 |  | 4 | 10
Currency Translation | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 0
Payments for Restructuring | 0 |  | 0 | 0
Restructuring Reserve, Settled without Cash | (2) |  | (1) | 0
Restructuring Reserve | 1 |  | (1) | 0
Global Products | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 113
Building Solutions EMEA/LA | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 56
Corporate Segment | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 50
Building Solutions Asia Pacific | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 16
Building Solutions North America | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 20
Continuing Operations | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 255
Discontinued Operations | Power Solutions | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | $ 8
Transfer To Held for Sale [Member] | Power Solutions | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (4) |
Transfer To Held for Sale [Member] | Power Solutions | Employee Severance | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | (4) |
Transfer To Held for Sale [Member] | Power Solutions | Fixed Asset Impairment | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |
Transfer To Held for Sale [Member] | Power Solutions | Other Restructuring | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |
Transfer To Held for Sale [Member] | Power Solutions | Currency Translation | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve, Settled without Cash |  |  | $ 0 |
Adoption of ASC 842 | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Adoption of ASC 842 | (4) |  |  |
Adoption of ASC 842 | Employee Severance | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Adoption of ASC 842 | 0 |  |  |
Adoption of ASC 842 | Fixed Asset Impairment | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Adoption of ASC 842 | 0 |  |  |
Adoption of ASC 842 | Other Restructuring | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Adoption of ASC 842 | (4) |  |  |
Adoption of ASC 842 | Currency Translation | 2018 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Adoption of ASC 842 | $ 0 |  |  |

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