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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Fair Value Measurements
Commodity contract derivatives, assets	$ 33	$ 152
Commodity contract derivatives, liabilities	2	7
Fair Value, Inputs, Level 3
Fair Value Measurements
Commodity contract derivatives, assets	0	0
Commodity contract derivatives, liabilities	$ 0	$ 0

X

- Definition

The fair value as of the balance sheet date of firm obligations in physical commodity contracts (for example, agricultural products, metals and energy).

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value as of the balance sheet date of firm holdings in physical commodity contracts (for example, agricultural products, metals and energy). Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Balance Type:
Period Type: