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Revenue Recognition (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Oct. 01, 2018 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Contract with Customer Asset Liability Net | $ (212,000,000) |  | $ (212,000,000) |  | $ (102,000,000) |
Revenue, Net | 5,779,000,000 | $ 5,630,000,000 | 11,243,000,000 | $ 10,935,000,000 |  |
Contract with Customer, Liability, Revenue Recognized | 214,000,000 |  | 926,000,000 |  |  |
Deferred revenue | (1,521,000,000) |  | (1,521,000,000) |  |  | $ (1,326,000,000)
Revenue, Remaining Performance Obligation, Amount | $ 13,900,000,000 |  | $ 13,900,000,000 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation | 60.00% |  | 60.00% |  |  |
Capitalized Contract Cost, Gross | $ 184,000,000 |  | $ 184,000,000 |  |  |
Capitalized Contract Cost, Amortization | 34,000,000 |  | 69,000,000 |  |  |
Capitalized Contract Cost, Impairment Loss |  |  | 0 |  |  |
Products and Systems [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 4,240,000,000 |  | 8,162,000,000 |  |  |
Services [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 1,539,000,000 |  | 3,081,000,000 |  |  |
Building Solutions North America |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 2,187,000,000 |  | 4,303,000,000 |  |  |
Building Solutions North America | Products and Systems [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 1,387,000,000 |  | 2,708,000,000 |  |  |
Building Solutions North America | Services [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 800,000,000 |  | 1,595,000,000 |  |  |
Building Solutions EMEA/LA |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 878,000,000 |  | 1,785,000,000 |  |  |
Building Solutions EMEA/LA | Products and Systems [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 416,000,000 |  | 833,000,000 |  |  |
Building Solutions EMEA/LA | Services [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 462,000,000 |  | 952,000,000 |  |  |
Building Solutions Asia Pacific |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 628,000,000 |  | 1,241,000,000 |  |  |
Building Solutions Asia Pacific | Products and Systems [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 351,000,000 |  | 707,000,000 |  |  |
Building Solutions Asia Pacific | Services [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 277,000,000 |  | 534,000,000 |  |  |
Global Products |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 2,086,000,000 |  | 3,914,000,000 |  |  |
Global Products | Global Products- Building Management [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 320,000,000 |  | 601,000,000 |  |  |
Global Products | Global Products- HVAC & Refrigeration Equipment [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 1,474,000,000 |  | 2,759,000,000 |  |  |
Global Products | Global Products- Specialty [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 292,000,000 |  | 554,000,000 |  |  |
Global Products | Products and Systems [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 2,086,000,000 |  | 3,914,000,000 |  |  |
Global Products | Services [Domain] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenue, Net | 0 |  | 0 |  |  |
Other Current Assets |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Capitalized Contract Cost, Gross | 98,000,000 |  | 98,000,000 |  |  |
Accounts Receivable [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Contract with Customer, Asset, Gross, Current | 1,343,000,000 |  | 1,343,000,000 |  |  |
Contract with Customer, Asset, Net, Current |  |  |  |  | 1,261,000,000 |
Other Noncurrent Assets |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Contract with Customer, Asset, Gross, Noncurrent | 85,000,000 |  | 85,000,000 |  | 85,000,000 |
Capitalized Contract Cost, Gross | 86,000,000 |  | 86,000,000 |  |  |
Deferred Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Deferred revenue | (1,521,000,000) |  | (1,521,000,000) |  | (1,335,000,000) |
Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Contract with Customer, Liability, Noncurrent | $ (119,000,000) |  | $ (119,000,000) |  | $ (113,000,000) |

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