Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Benefit Plans Contributions (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Retirement Plan Disclosure
Remaining Employer Contributions		$ 75
Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions		225
defined benefit plan, plan assets, monthly contributions by employer		25
Other Post-retirement Benefits
Retirement Plan Disclosure
Defined benefit plan contributions		19
SERP
Retirement Plan Disclosure
Defined benefit plan contributions		10
Rebates [Member]
Retirement Plan Disclosure
Defined benefit plan contributions		4
401K [Member]
Retirement Plan Disclosure
Defined benefit plan contributions		$ 95
Minimum \| Other Pension Plan
Retirement Plan Disclosure
Defined benefit plan contributions	$ 300