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Significant Restructuring Costs Change in Restructuring Reserve - 2017 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs | $ 0 | $ 154 |  |
2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | $ 367
Payments for Restructuring | (2) |  | $ (158) | (75)
Restructuring Reserve, Settled without Cash | (2) |  | (1) | (78)
Adjustment to restructuring reserves |  |  |  | 25
Restructuring Reserve | 73 |  | 80 | 239
Employee Severance | 2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 276
Payments for Restructuring | (2) |  | (152) | (75)
Restructuring Reserve, Settled without Cash | 0 |  | 0 | 0
Adjustment to restructuring reserves |  |  |  | 25
Restructuring Reserve | 69 |  | 74 | 226
Fixed Asset Impairment | 2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 77
Payments for Restructuring | 0 |  | 0 | 0
Restructuring Reserve, Settled without Cash | 0 |  | 0 | (77)
Adjustment to restructuring reserves |  |  |  | 0
Restructuring Reserve | 0 |  | 0 | 0
Other Restructuring | 2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and impairment costs |  |  |  | 14
Payments for Restructuring | 0 |  | (6) | 0
Restructuring Reserve, Settled without Cash | 0 |  | 0 | (1)
Adjustment to restructuring reserves |  |  |  | 0
Restructuring Reserve | 7 |  | 7 | 13
Currency Translation | 2017 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
Adjustment to restructuring reserves |  |  |  | 0
Restructuring Reserve | (3) |  | $ (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] | Fixed 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

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