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Revenue Recognition (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Oct. 01, 2018
Disaggregation of Revenue [Line Items] |  |  |
Contract with Customer Asset Liability Net | $ (95,000,000) |  | $ (102,000,000)
Revenue, Net | 5,464,000,000 | $ 5,305,000,000 |
Contract with Customer, Liability, Revenue Recognized | 712,000,000 |  |
Revenue, Remaining Performance Obligation | $ 13,700,000,000 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation | 60.00% |  |
Capitalized Contract Cost, Gross | $ 175,000,000 |  |
Capitalized Contract Cost, Amortization | 35,000,000 |  |
Capitalized Contract Cost, Impairment Loss | 0 |  |
Products and Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 3,922,000,000 |  |
Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 1,542,000,000 |  |
Building Solutions North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 2,116,000,000 |  |
Building Solutions North America | Products and Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 1,321,000,000 |  |
Building Solutions North America | Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 795,000,000 |  |
Building Solutions EMEA/LA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 907,000,000 |  |
Building Solutions EMEA/LA | Products and Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 417,000,000 |  |
Building Solutions EMEA/LA | Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 490,000,000 |  |
Building Solutions Asia Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 613,000,000 |  |
Building Solutions Asia Pacific | Products and Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 356,000,000 |  |
Building Solutions Asia Pacific | Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 257,000,000 |  |
Global Products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 1,828,000,000 |  |
Global Products | Global Products- Building Management [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 281,000,000 |  |
Global Products | Global Products- HVAC & Refrigeration Equipment [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 1,285,000,000 |  |
Global Products | Global Products- Specialty [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 262,000,000 |  |
Global Products | Products and Systems [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 1,828,000,000 |  |
Global Products | Services [Domain] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Net | 0 |  |
Other Current Assets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized Contract Cost, Gross | 91,000,000 |  |
Accounts Receivable [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract with Customer, Asset, Gross, Current | 1,320,000,000 |  |
Contract with Customer, Asset, Net, Current |  |  | 1,261,000,000
Other Noncurrent Assets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract with Customer, Asset, Gross, Noncurrent | 73,000,000 |  | 85,000,000
Capitalized Contract Cost, Gross | 84,000,000 |  |
Deferred Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract with Customer, Liability, Current | (1,378,000,000) |  | (1,335,000,000)
Other Noncurrent Liabilities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract with Customer, Liability, Noncurrent | $ (110,000,000) |  | $ (113,000,000)

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