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Revenue Recognition (Details) - USD ($)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2018
Disaggregation of Revenue [Line Items]        
Net sales $ 23,968,000,000 $ 23,400,000,000 $ 22,835,000,000  
Contract with Customer, Liability, Current (1,407,000,000) $ (1,326,000,000)    
Contract with Customer Asset Liability Net (45,000,000)     $ (102,000,000)
Contract with Customer, Liability, Revenue Recognized 1,200,000,000      
Revenue, Remaining Performance Obligation, Amount $ 14,400,000,000      
Remaining Performance Obligations Expected as Revenue Over the Next Two Years 60.00%      
Capitalized Contract Cost, Gross $ 212,000,000      
Capitalized Contract Cost, Amortization 157,000,000      
Capitalized Contract Cost, Impairment Loss 0      
Products and Systems [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 17,711,000,000      
Services [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 6,257,000,000      
Building Solutions North America        
Disaggregation of Revenue [Line Items]        
Net sales 9,031,000,000      
Building Solutions North America | Products and Systems [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 5,745,000,000      
Building Solutions North America | Services [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 3,286,000,000      
Building Solutions EMEA/LA        
Disaggregation of Revenue [Line Items]        
Net sales 3,655,000,000      
Building Solutions EMEA/LA | Products and Systems [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 1,767,000,000      
Building Solutions EMEA/LA | Services [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 1,888,000,000      
Building Solutions Asia Pacific        
Disaggregation of Revenue [Line Items]        
Net sales 2,658,000,000      
Building Solutions Asia Pacific | Products and Systems [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 1,575,000,000      
Building Solutions Asia Pacific | Services [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 1,083,000,000      
Global Products        
Disaggregation of Revenue [Line Items]        
Net sales 8,624,000,000      
Global Products | Products and Systems [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 8,624,000,000      
Global Products | Services [Domain]        
Disaggregation of Revenue [Line Items]        
Net sales 0      
Global Products | Building management systems        
Disaggregation of Revenue [Line Items]        
Net sales 1,292,000,000      
Global Products | HVAC & refrigeration equipment        
Disaggregation of Revenue [Line Items]        
Net sales 6,181,000,000      
Global Products | Specialty products        
Disaggregation of Revenue [Line Items]        
Net sales 1,151,000,000      
Other current assets        
Disaggregation of Revenue [Line Items]        
Capitalized Contract Cost, Gross 110,000,000      
Accounts Receivable [Member]        
Disaggregation of Revenue [Line Items]        
Contract with Customer, Asset, Net, Current 1,389,000,000     1,261,000,000
Other noncurrent assets        
Disaggregation of Revenue [Line Items]        
Contract with Customer, Asset, Net, Noncurrent 90,000,000     85,000,000
Capitalized Contract Cost, Gross 102,000,000      
Deferred Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Contract with Customer, Liability, Current (1,407,000,000)     (1,335,000,000)
Other Noncurrent Liabilities [Member]        
Disaggregation of Revenue [Line Items]        
Contract with Customer, Liability, Noncurrent $ (117,000,000)     $ (113,000,000)