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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,111	$ 469	$ 271
Net unrealized gain (loss) on cash flow hedges	(72)	4	78
Reclassification to earnings from cash flow hedges	65	(2)	(1)
Total other comprehensive income (loss)	(7)	2	77
Total comprehensive income (loss)	$ 1,104	$ 471	$ 348

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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