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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) $ in Millions	9 Months Ended
	Jun. 30, 2019 USD ($)
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 164
Decreases related to positions taken on items from prior years	(3)
Increases related to positions taken in the current year	5
Lapse of statute of limitations	(8)
Balance at end of period	$ 158

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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-Section 50
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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