Guarantees and Indemnifications (Tables)
 6 Months Ended
Mar. 31, 2016
Guarantees and Indemnifications Abstract  
Changes in Accrued Product Warranty Costs
Changes in the carrying amount of accrued product warranty costs are summarized as follows:
 
Six Months Ended
 
March 31
(in millions)
2016
 
2015
Balance at beginning of year
$
89

 
$
104

Warranty costs incurred
(21
)
 
(24
)
Product warranty accrual
18

 
24

Changes in estimates for prior years
(2
)
 
(5
)
Foreign currency translation adjustments and other
—

 
(2
)
Balance at March 31
$
84

 
$
97