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Significant Restructuring and Impairment Costs (Changes in Company's Restructuring Reserve) (Detail)
$ in Millions
 12 Months Ended 24 Months Ended
Sep. 30, 2017
USD ($)
Plant
Employees
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2017
USD ($)
Plant
Employees
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs $ 367 $ 288 $ 215  
Restructuring reserve, beginning balance $ 445      
Restructuring reserve, ending balance   445    
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees       6,100
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employees 1,600     1,600
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant 10      
Number Of Plants Closed | Plant 4     4
2016 Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
The following table summarizes the changes in the Company’s 2016 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions):
 
Employee Severance and Termination Benefits
 
Long-Lived Asset Impairments
 
Other
 
Currency
Translation
 
Total
 
 
 
 
 
 
 
 
 
 
Original Reserve
$
368

 
$
190

 
$
62

 
$
—

 
$
620

Acquired Tyco restructuring
    reserves
78

 
—

 
—

 
—

 
78

Utilized—cash
(32
)
 
—

 
—

 
—

 
(32
)
Utilized—noncash
—

 
(190
)
 
(32
)
 
1

 
(221
)
Balance at September 30, 2016
$
414

 
$
—

 
$
30


$
1

 
$
445

Adient spin-off impact
(194
)
 
—

 
(22
)
 
—

 
(216
)
Utilized—cash
(86
)
 
—

 
(2
)
 
—

 
(88
)
Utilized—noncash
—

 
—

 
—

 
1

 
1

Adjustment to restructuring
   reserves
(25
)
 
—

 
—

 
—

 
(25
)
Transfer to liabilities held for sale
(3
)
 
—

 
—

 
—

 
(3
)
Adjustment to acquired Tyco
   restructuring reserves
(22
)
 
—

 
—

 
—

 
(22
)
Balance at September 30, 2017
$
84

 
$
—

 
$
6

 
$
2

 
$
92

      
Restructuring and impairment costs   620    
Utilized - cash $ (88) (32)    
Restructuring Reserve, Settled without Cash 1 (221)    
Restructuring reserve, ending balance 92     $ 92
Adjustment to restructuring reserves (25)      
2016 Restructuring Plan [Member] | Fixed Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   190    
Restructuring reserve, beginning balance 0      
Utilized - cash 0 0    
Restructuring Reserve, Settled without Cash 0 (190)    
Restructuring reserve, ending balance 0 0   0
Adjustment to restructuring reserves 0      
2016 Restructuring Plan [Member] | Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   62    
Restructuring reserve, beginning balance 30      
Utilized - cash (2) 0    
Restructuring Reserve, Settled without Cash 0 (32)    
Restructuring reserve, ending balance 6 30   6
Adjustment to restructuring reserves 0      
2016 Restructuring Plan [Member] | Currency Translation        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   0    
Restructuring reserve, beginning balance 1      
Utilized - cash 0 0    
Restructuring Reserve, Settled without Cash 1 1    
Restructuring reserve, ending balance 2 1   2
Adjustment to restructuring reserves 0      
2016 Restructuring Plan [Member] | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   368    
Restructuring reserve, beginning balance 414      
Utilized - cash (86) (32)    
Restructuring Reserve, Settled without Cash 0 0    
Restructuring reserve, ending balance 84 414   84
Adjustment to restructuring reserves $ (25)      
2016 Restructuring Plan [Member] | Continuing Operations [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   288    
2017 Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
The following table summarizes the changes in the Company’s 2017 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions):
 
Employee Severance and Termination Benefits
 
Long-Lived Asset Impairments
 
Other
 
Currency
Translation
 
Total
 
 
 
 
 
 
 
 
 
 
Original Reserve
$
276

 
$
77

 
$
14

 
$
—

 
$
367

Utilized—cash
(75
)
 
—

 
—

 
—

 
(75
)
Utilized—noncash
—

 
(77
)
 
(1
)
 
—

 
(78
)
Adjustment to restructuring reserves
25

 
—

 
—

 
—

 
25

Balance at September 30, 2017
$
226

 
$
—

 
$
13


$
—

 
$
239

      
Restructuring and impairment costs $ 367      
Utilized - cash (75)      
Restructuring Reserve, Settled without Cash (78)      
Restructuring reserve, ending balance 239     239
Adjustment to restructuring reserves 25      
2017 Restructuring Plan [Member] | Fixed Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs 77      
Utilized - cash 0      
Restructuring Reserve, Settled without Cash (77)      
Restructuring reserve, ending balance 0     0
Adjustment to restructuring reserves 0      
2017 Restructuring Plan [Member] | Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs 14      
Utilized - cash 0      
Restructuring Reserve, Settled without Cash (1)      
Restructuring reserve, ending balance 13     13
Adjustment to restructuring reserves 0      
2017 Restructuring Plan [Member] | Currency Translation        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs 0      
Utilized - cash 0      
Restructuring Reserve, Settled without Cash 0      
Restructuring reserve, ending balance 0     0
Adjustment to restructuring reserves 0      
2017 Restructuring Plan [Member] | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs 276      
Utilized - cash (75)      
Restructuring Reserve, Settled without Cash 0      
Restructuring reserve, ending balance 226     $ 226
Adjustment to restructuring reserves 25      
2017 Restructuring Plan [Member] | Continuing Operations [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs 367      
Committed restructuring liabilities assumed from Tyco Merger [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   78    
Restructuring Reserve, Settled without Cash (22)      
Committed restructuring liabilities assumed from Tyco Merger [Member] | Fixed Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   0    
Restructuring Reserve, Settled without Cash 0      
Committed restructuring liabilities assumed from Tyco Merger [Member] | Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   0    
Restructuring Reserve, Settled without Cash 0      
Committed restructuring liabilities assumed from Tyco Merger [Member] | Currency Translation        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   0    
Restructuring Reserve, Settled without Cash 0      
Committed restructuring liabilities assumed from Tyco Merger [Member] | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   78    
Restructuring Reserve, Settled without Cash (22)      
Committed restructuring liabilities assumed from Tyco Merger [Member] | Continuing Operations [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs   56    
Corporate        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs $ (166) (161) (166)  
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees       1,200
Building Technologies & Solutions        
Restructuring Cost and Reserve [Line Items]        
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees       4,800
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant 10      
Power Solutions        
Restructuring Cost and Reserve [Line Items]        
Restructuring and impairment costs $ (20) $ (66) $ (11)  
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employees       100
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash (3)      
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Fixed Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash 0      
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash 0      
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Currency Translation        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash 0      
Scott Safety business [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash (3)      
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash (216)      
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Fixed Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash 0      
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Other Restructuring [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash (22)      
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Currency Translation        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash 0      
Adient spin-off [Member] | 2016 Restructuring Plan [Member] | Transfer To Held for Sale [Member] | Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Settled without Cash $ (194)