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Basis of Presentation and Summary of Significant Accounting Policies - VIE (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity [Line Items]
Current assets	$ 4,482	$ 4,116
Total assets	10,261	10,342	$ 10,942
Current liabilities	3,819	3,835
Noncurrent liabilities	4,864	4,267
Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Current assets	217	236
Noncurrent assets	74	40
Total assets	291	276
Current liabilities	204	235
Noncurrent liabilities	10	0
Total liabilities	$ 214	$ 235

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