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Fair Value Measurements - Summary of Investment Income, Realized Gains and Disbursements Related to Investments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended			12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Investment income	$ 2	$ 2	$ 6	[1]	$ 7	$ 9	[1]
Realized gains	0	0	4		2	2
Disbursements	$ (7)	$ (7)	$ (25)		$ (19)	$ (27)
[1] Investment income for the demand deposit includes interest income as well as dividend income transferred from the equity and corporate bond mutual funds.

X

- Definition

The cash outflow of all demand deposits, including checking and negotiable order or withdrawal (NOW) accounts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on available-for-sale securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration