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Intangible Assets, Net (Tables)
 12 Months Ended
Sep. 30, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of Intangible Assets by Major Class
Indefinite-lived and finite-lived intangible assets consisted of the following: 
 
September 30, 2015
 
September 30, 2014
 
Gross
 
Accumulated
Amortization
 
Net
 
Gross
 
Accumulated
Amortization
 
Net
 
(in millions)
Finite-lived intangible assets:
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
$
351

 
$
(196
)
 
$
155

 
$
339

 
$
(162
)
 
$
177

Trade names
192

 
(67
)
 
125

 
192

 
(54
)
 
138

Reseller relationships
95

 
(59
)
 
36

 
95

 
(48
)
 
47

Other
53

 
(17
)
 
36

 
52

 
(12
)
 
40

Total finite-lived intangible assets
$
691

 
$
(339
)
 
$
352

 
$
678

 
$
(276
)
 
$
402

Indefinite-lived intangible assets
 
 
 
 
11,009

 
 
 
 
 
11,009

Total intangible assets, net
 
 
 
 
$
11,361

 
 
 
 
 
$
11,411
Schedule of Estimated Future Amortization Expense
At September 30, 2015, estimated future amortization expense on finite-lived intangible assets is as follows:
Fiscal:
 
2016
 
2017
 
2018
 
2019
 
2020 and
thereafter
 
Total
 
 
(in millions)
Estimated future amortization expense
 
$
51

 
$
49

 
$
43

 
$
43

 
$
166

 
$
352