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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, 2023	Sep. 30, 2022
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 283	$ 493
Fair value of plan assets at end of year	263	283
Significant Unobservable Inputs (Level 3)
Change in Plan Assets:
Fair value of plan assets at beginning of year	7
Fair value of plan assets at end of year	4	7
Real estate \| Significant Unobservable Inputs (Level 3)
Change in Plan Assets:
Fair value of plan assets at beginning of year	7	7
Redemptions	(2)	0
Unrealized gain (loss)	(1)	0
Fair value of plan assets at end of year	$ 4	$ 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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