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Retirement Plans - Changes in the Fair Value of Pension Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Change in Plan Assets:
Unrealized gain	$ 0	$ 1
Pension plan
Change in Plan Assets:
Fair value of plan assets at beginning of year	493	486
Fair value of plan assets at end of year	283	493
Significant Unobservable Inputs (Level 3) \| Pension plan
Change in Plan Assets:
Fair value of plan assets at beginning of year	7
Fair value of plan assets at end of year	7	7
Real estate \| Significant Unobservable Inputs (Level 3) \| Pension plan
Change in Plan Assets:
Fair value of plan assets at beginning of year	7	6
Redemptions	0	0
Fair value of plan assets at end of year	$ 7	$ 7

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.

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