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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, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs | $ 0 | $ 158 | $ 99 | $ 78 | $ 158 | $ 177 |  |
2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 288
2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 367 |
Payments for Restructuring |  |  |  |  | (112) |  | (75) |
Restructuring Reserve, Settled without Cash |  |  |  |  | 1 |  | (78) |
Adjustment to restructuring reserves |  |  |  |  |  |  | 25 |
Restructuring Reserve | 128 |  |  |  | 128 |  | 239 |
Employee Severance | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 276 |
Payments for Restructuring |  |  |  |  | (109) |  | (75) |
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 |  | 0 |
Adjustment to restructuring reserves |  |  |  |  |  |  | 25 |
Restructuring Reserve | 117 |  |  |  | 117 |  | 226 |
Fixed Asset Impairment | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 77 |
Payments for Restructuring |  |  |  |  | 0 |  | 0 |
Restructuring Reserve, Settled without Cash |  |  |  |  | 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 |  |  |  |  | (3) |  | 0 |
Restructuring Reserve, Settled without Cash |  |  |  |  | 0 |  | (1) |
Adjustment to restructuring reserves |  |  |  |  |  |  | 0 |
Restructuring Reserve | 10 |  |  |  | 10 |  | 13 |
Currency Translation | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 0 |
Payments for Restructuring |  |  |  |  | 0 |  | 0 |
Restructuring Reserve, Settled without Cash |  |  |  |  | 1 |  | 0 |
Adjustment to restructuring reserves |  |  |  |  |  |  | 0 |
Restructuring Reserve | $ 1 |  |  |  | $ 1 |  | 0 |
Corporate Segment | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 161
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 |
Power Solutions | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | 66
Power Solutions | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 20 |
Building Solutions Asia Pacific | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | 16 |
Global Products | 2016 Restructuring Plan [Domain] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  |  | $ 44
Global Products | 2017 Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and impairment costs |  |  |  |  |  |  | $ 32 |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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