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Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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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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