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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Fair Value Measurements
Commodity contract derivatives, assets	$ 16	$ 7
Commodity contract derivatives, liabilities	6	5
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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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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Topic 820
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- 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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