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Retirement Plans - Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Pension Plan
Schedule Of Retirement Plans [Line Items]
Accumulated benefit obligation	$ 2,004	$ 4,402
Projected benefit obligation	2,013	4,519
Fair value of plan assets	1,720	3,841
Fair value of plan assets	1,729	3,954
Postretirement Benefits
Schedule Of Retirement Plans [Line Items]
Projected benefit obligation	68	96
Fair value of plan assets	$ 28	$ 38

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Schedule Of Retirement Plans [Line Items]

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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