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Guarantees and Indemnifications (Tables)
 3 Months Ended
Dec. 31, 2017
Guarantees and Indemnifications Abstract  
Changes in the Carrying Amount of Accrued Product Warranty Costs
Changes in the carrying amount of accrued product warranty costs are summarized as follows:
 
Three Months Ended
 
December 31
(in millions)
2017
 
2016
Balance at beginning of year
$
186

 
$
87

Warranty costs incurred
(21
)
 
(10
)
Product warranty accrual
21

 
9

Changes in estimates for prior years
—

 
(2
)
Balance at December 31, 2017
$
186

 
$
84