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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,512	$ 1,352	$ 1,417
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	126	(1)	(114)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(97)	(38)	(45)
Total other comprehensive income (loss)	29	(39)	(69)
Total comprehensive income (loss)	$ 1,541	$ 1,313	$ 1,348

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