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Retirement Plans - Changes in the Fair Value of Pension Assets (Details) - Pension plan - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 470	$ 449
Fair value of plan assets at end of year	486	470
Significant Unobservable Inputs (Level 3)
Change in Plan Assets:
Fair value of plan assets at beginning of year	6
Fair value of plan assets at end of year	6	6
Real estate | Significant Unobservable Inputs (Level 3)
Change in Plan Assets:
Fair value of plan assets at beginning of year	6	6
Redemptions	0	0
Fair value of plan assets at end of year	$ 6	$ 6

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

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