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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,119	$ 685	$ 1,233
Net unrealized gain (loss) on cash flow hedges	10	59	(139)
Reclassification to earnings from cash flow hedges	26	(26)	129
Total other comprehensive income (loss)	36	33	(10)
Total comprehensive income (loss)	$ 1,155	$ 718	$ 1,223

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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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