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Stock Incentive Plans - Components of Pre-Tax Stock-Based Compensation Expense Included in Continuing Operations (Parenthetical) (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Mar. 31, 2026

Mar. 31, 2025

Mar. 31, 2026

Mar. 31, 2025

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

$ 5

^[1]

$ 5

^[2]

$ 10

^[1]

$ 9

^[2]

Cash-settled Nonvested Restricted Stock Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

0

0

1

1

Cash-settled Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

$ 0

$ 0

$ 1

Cash-settled Performance Shares [Member] | Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation

$ 1

[1]	Included zero and $1 million of expense related to cash-settled nonvested restricted stock awards during the three and six months ended March 31, 2026, respectively, and zero and less than $1 million of expense related to cash-settled performance units during the three and six months ended March 31, 2026, respectively.
[2]	Included zero and $1 million of expense related to cash-settled nonvested restricted stock awards during the three and six months ended March 31, 2025, respectively, and zero and income of $1 million related to cash-settled performance units during the three and six months ended March 31, 2025, respectively.

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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