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Stock Incentive Plans - Additional Information (Details) - USD ($)
$ in Millions

3 Months Ended

Dec. 31, 2019

Dec. 31, 2018

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

Stock-based compensation

$ 5

^[1]

$ 6

^[2]

Number of common shares for each converted performance share

1

Stock Appreciation Rights (SARs) [Member]

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

Unexercised SARs generally lapse expiration period

10 years

Grants of share-based payment awards in period

231,000

300,000

Total unrecognized compensation costs

$ 7

Model to fair value share-based payment awards

Black-Scholes option-pricing model

Unrecognized cost expected to be recognized over a weighted-average period (in years)

2 years 2 months 12 days

Stock-based compensation

$ 2

^[1]

$ 2

^[2]

Stock Appreciation Rights (SARs) [Member] | Minimum [Member]

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

Vesting period of share-based payment award

1 year

Stock Appreciation Rights (SARs) [Member] | Maximum [Member]

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

Vesting period of share-based payment award

3 years

Nonvested Stock Awards [Member]

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

Grants of share-based payment awards in period

86,000

81,000

Total unrecognized compensation costs

$ 10

Unrecognized cost expected to be recognized over a weighted-average period (in years)

2 years 1 month 6 days

Stock-based compensation

$ 2

^[1]

$ 4

^[2]

Nonvested Stock Awards [Member] | Minimum [Member]

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

Vesting period of share-based payment award

1 year

Nonvested Stock Awards [Member] | Maximum [Member]

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

Vesting period of share-based payment award

3 years

Cash-settled Nonvested Stock Awards [Member]

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

Vesting period of share-based payment award

3 years

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number

92,000

Stock-based compensation

$ 1

1

Restricted Stock [Member]

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

Stock-based compensation

$ 0

$ 1

Performance Shares [Member]

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

Vesting period of share-based payment award

3 years

Grants of share-based payment awards in period

51,000

78,000

Total unrecognized compensation costs

$ 8

Unrecognized cost expected to be recognized over a weighted-average period (in years)

2 years 6 months

Stock-based compensation

^[1]

$ 1

[1]	Included $1 million of expense related to cash-settled nonvested restricted stock awards and zero related to cash-settled performance units during the three months ended December 31, 2019
[2]	Included $1 million of expense related to cash-settled nonvested restricted stock awards and $2 million of income related to cash-settled performance units during the three months ended December 31, 2018.

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