v3.5.0.1
Goodwill and Other Intangible Assets
6 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets
Goodwill
There were no material changes in the carrying amount of goodwill in either of the Company's reportable segments during the six months ended March 31, 2016.
Other Intangible Assets
The following table sets forth the gross carrying amounts and accumulated amortization of the Company's other intangible assets as of March 31, 2016 and September 25, 2015 ($ in millions):
 
March 31, 2016
 
September 25, 2015
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
Amortizable:
 
 
 
 
 
 
 
Contracts and related customer relationships
$
8,223

 
$
(5,274
)
 
$
8,147

 
$
(5,183
)
Other
41

 
(7
)
 
41

 
(6
)
Total
$
8,264

 
$
(5,281
)
 
$
8,188

 
$
(5,189
)

The changes in the net carrying amount of contracts and related customer relationships during the six months ended March 31, 2016 were as follows ($ in millions):
Balance as of September 25, 2015
$
2,964

Customer contract additions, net of dealer charge-backs
285

Amortization
(308
)
Currency translation and other
8

Balance as of March 31, 2016
$
2,949


The weighted-average amortization period for contracts and related customer relationships acquired during the six months ended March 31, 2016 was 15 years. Intangible asset amortization expense for the quarters and six months ended March 31, 2016 and March 27, 2015 was as follows ($ in millions):
 
For the Quarters Ended
 
For the Six Months Ended
 
March 31,
2016
 
March 27,
2015
 
March 31,
2016
 
March 27,
2015
Intangible asset amortization expense
$
155

 
$
153

 
$
309

 
$
309


The estimated aggregate amortization expense for intangible assets is expected to be as follows ($ in millions):
Remainder of fiscal 2016
$
296

Fiscal 2017
516

Fiscal 2018
430

Fiscal 2019
368

Fiscal 2020
295

Fiscal 2021
214


Other than goodwill, the Company does not have any other indefinite-lived intangible assets as of March 31, 2016.