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Debt - Summary of Net Interest and Other Expense (Income) (Details) - USD ($)
$ in Millions

12 Months Ended

Sep. 30, 2019

Sep. 30, 2018

Sep. 30, 2017

Debt Disclosure [Abstract]

Interest expense

^[1]

$ 114

$ 116

$ 227

Interest income

(2)

(4)

(4)

Investment securities income

^[2]

(17)

(14)

(11)

Other financing costs

^[3]

4

4

17

Interest Income (Expense), Net

$ 99

$ 102

$ 229

[1]	Includes $6 million, $1 million and $101 million of accelerated accretion and/or amortization for original issue discounts and debt issuance costs during 2019, 2018 and 2017, respectively.
[2]	Represents investment income related to the restricted investments discussed in Note G.
[3]	Includes costs of $16 million related to early redemption premium payments and bondholder consent fees for the 2022 and 2018 Senior Notes and a net gain of $5 million related to the repayment of the 2029 Notes during 2017.

X

- Definition

Amount of dividend, interest income and realized gains and losses on available-for-sale securities

+ References

No definition available.

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- References

No definition available.

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- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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- Definition

The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 220
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
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- Definition

The net amount of operating interest income (expense).

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-Name Accounting Standards Codification
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-SubTopic 220
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