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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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

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

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

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

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		$ 544	$ 527
Total accumulated benefit obligation		5,634	5,859
Accumulated benefit obligations in excess of plan assets for retirement plans, projected benefit obligation		711	1,153
Accumulated benefit obligations in excess of plan assets for retirement plans, accumulated benefit obligation		626	1,034
Accumulated benefit obligations in excess of plan assets for retirement plans, fair value of plan assets		123	492
Pension contribution		41	66	$ 60
Retirement plans expense		28	67	2
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation		1,142	1,200
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation		1,016	1,055
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Future benefit payments, 2022		10
Future benefit payments, 2023		10
Future benefit payments, 2024		10
Future benefit payments, 2025		10
Future benefit payments, 2026		10
Total future benefit payments, 2027 - 2031		38
Benefit obligation, ending (recognized in balance sheet)		119	135
Retirement plans expense		(15)	(12)	$ (12)
Benefits paid		(9)	(12)
Deferred actuarial gains in accumulated other comprehensive income		98	$ 106
Fair Value Measured at Net Asset Value Per Share [Member] \| Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments for private equity funds		$ 270
Period distributions of underlying assets are expected to occur		10 years
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contribution	$ 50
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Over (Under) funded plans		$ 506
Unfunded plans		(220)
Future benefit payments, 2022		212
Future benefit payments, 2023		217
Future benefit payments, 2024		222
Future benefit payments, 2025		227
Future benefit payments, 2026		231
Total future benefit payments, 2027 - 2031		$ 1,192
Discount rate		2.92%	2.81%	3.22%
Benefit obligation, ending (recognized in balance sheet)		$ 506	$ (142)
Retirement plans expense		27	62	$ 2
Benefits paid		(218)	$ (202)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Over (Under) funded plans		(88)
Unfunded plans		(318)
Future benefit payments, 2022		68
Future benefit payments, 2023		66
Future benefit payments, 2024		70
Future benefit payments, 2025		71
Future benefit payments, 2026		74
Total future benefit payments, 2027 - 2031		$ 415
Discount rate		2.20%	1.90%	1.90%
Benefit obligation, ending (recognized in balance sheet)		$ (88)	$ (266)
Retirement plans expense		1	5	$ 0
Benefits paid		$ (39)	$ (37)