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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,352	$ 1,417	$ 1,119
Net unrealized gain (loss) on cash flow hedges	(1)	(114)	10
Reclassification to earnings from cash flow hedges	(38)	(45)	(26)
Total other comprehensive income (loss)	(39)	(69)	36
Total comprehensive income (loss)	$ 1,313	$ 1,348	$ 1,155

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