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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) $ in Millions	9 Months Ended
	Jun. 30, 2018 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at October 1, 2017	$ 194
Increases related to positions taken on items from prior years	3
Decreases related to positions taken on items from prior years	(2)
Increases related to positions taken in the current year	8
Settlements	(1)
Lapse of statute of limitations	(1)
Balance at June 30, 2018	$ 201

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Amount of unrecognized tax benefits.

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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 decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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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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