Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Sep. 30, 2016

Valuation And Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II — Valuation and Qualifying Accounts

			Additions
	Balance at		Charged to							Balance at
	Beginning		Cost and							End of
Description	of Period		Expenses		Deductions			Other (a)		Period
	(in millions)
Year Ended September 30, 2016
Allowance for doubtful accounts	$	12	$	6	$	—		$	1	$	19
Reserves for sales returns		44		131		(142	)		—		33
Allowance for deferred tax asset		344		27		(61	)		—		310
Year Ended September 30, 2015
Allowance for doubtful accounts	$	11	$	7	$	(6	)	$	—	$	12
Reserves for sales returns		54		161		(171	)		—		44
Allowance for deferred tax asset		394		34		(84	)		—		344
Year Ended September 30, 2014
Allowance for doubtful accounts	$	2	$	2	$	—		$	7	$	11
Reserves for sales returns		53		194		(193	)		—		54
Allowance for deferred tax asset		296		101		(3	)		—		394

(a) Other changes due to acquisitions and dispositions.