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Significant Restructuring Costs Change in Restructuring Reserve - 2017 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | $ 49 | $ 99 | $ 78 | $ 27 | $ 60 | $ 226 | $ 87 |
2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | 49 | 99 | 78 |  |  |  |  |
Payments for Restructuring | (34) | (13) |  |  |  |  |  |
Restructuring Reserve, Settled without Cash | (32) | (23) | (16) |  |  |  |  |
Restructuring Reserve | 108 | 125 | 62 |  |  | 108 |  |
Employee Severance | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | 16 | 67 | 62 |  |  |  |  |
Payments for Restructuring | (34) | (13) |  |  |  |  |  |
Restructuring Reserve, Settled without Cash | 0 | 0 | 0 |  |  |  |  |
Restructuring Reserve | 98 | 116 | 62 |  |  | 98 |  |
Fixed Asset Impairment | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | 31 | 23 | 15 |  |  |  |  |
Payments for Restructuring | 0 | 0 |  |  |  |  |  |
Restructuring Reserve, Settled without Cash | (31) | (23) | (15) |  |  |  |  |
Restructuring Reserve | 0 | 0 | 0 |  |  | 0 |  |
Other Restructuring | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | 2 | 9 | 1 |  |  |  |  |
Payments for Restructuring | 0 | 0 |  |  |  |  |  |
Restructuring Reserve, Settled without Cash | (1) | 0 | (1) |  |  |  |  |
Restructuring Reserve | 10 | 9 | 0 |  |  | 10 |  |
Continuing Operations | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 288
Continuing Operations | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | $ 49 | $ 99 | $ 78 |  |  | 226 |  |
Continuing Operations | Corporate Segment | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 161
Continuing Operations | Corporate Segment | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 79 |  |
Continuing Operations | Building Efficiency Asia | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 26
Continuing Operations | Building Efficiency Asia | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 9 |  |
Continuing Operations | Power Solutions | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 66
Continuing Operations | Power Solutions | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 4 |  |
Continuing Operations | Building Efficiency Systems and Service North America | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 2
Continuing Operations | Building Efficiency Systems and Service North America | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 14 |  |
Continuing Operations | Building Technologies & Solutions Tyco [Member] | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 8
Continuing Operations | Building Technologies & Solutions Tyco [Member] | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 73 |  |
Continuing Operations | Building Efficiency Products North America [Member] | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | 27 |  |
Continuing Operations | Building Efficiency Rest of World [Member] | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 16
Continuing Operations | Building Efficiency Rest of World [Member] | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  | $ 20 |  |

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