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Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension plan, projected benefit obligation	$ 225	$ 257
Pension plan, accumulated benefit obligation	201	230
Pension plan, fair value of plan assets	79	105
Amounts in AOCI	3	3
Pension plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, contributions	19	19
Expected contributions in fiscal 2020	17
Savings and investment plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contribution expense	$ 36	$ 56

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