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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, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation		$ 3,910	$ 5,634
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation		527	1,142
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation		444	1,016
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets		102	544
Accumulated benefit obligations in excess of plan assets for retirement plans, projected benefit obligation		477	711
Accumulated benefit obligations in excess of plan assets for retirement plans, accumulated benefit obligation		421	626
Accumulated benefit obligations in excess of plan assets for retirement plans, fair value of plan assets		63	123
Pension contribution		43	41	$ 66
Retirement plans expense		2	28	67
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Future benefit payments, 2023		10
Future benefit payments, 2024		10
Future benefit payments, 2025		9
Future benefit payments, 2026		9
Future benefit payments, 2027		8
Total future benefit payments, 2028 - 2032		33
Benefit obligation, ending (recognized in balance sheet)		83	119
Deferred actuarial gains in accumulated other comprehensive income		112	98
Retirement plans expense		(12)	(15)	$ (12)
Benefits paid		(10)	$ (9)
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		$ 190
Period distributions of underlying assets are expected to occur		10 years
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contribution	$ 40
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Over (Under) funded plans		$ (57)
Unfunded plans		(236)
Future benefit payments, 2023		60
Future benefit payments, 2024		58
Future benefit payments, 2025		59
Future benefit payments, 2026		62
Future benefit payments, 2027		65
Total future benefit payments, 2028 - 2032		$ 366
Discount rate		4.90%	2.20%	1.90%
Benefit obligation, ending (recognized in balance sheet)		$ (57)	$ (88)
Retirement plans expense		5	1	$ 5
Benefits paid		(40)	$ (39)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Over (Under) funded plans		513
Unfunded plans		(162)
Future benefit payments, 2023		215
Future benefit payments, 2024		220
Future benefit payments, 2025		225
Future benefit payments, 2026		229
Future benefit payments, 2027		232
Total future benefit payments, 2028 - 2032		$ 1,174
Discount rate		5.64%	2.92%	2.81%
Benefit obligation, ending (recognized in balance sheet)		$ 513	$ 506
Retirement plans expense		(3)	27	$ 62
Benefits paid		$ (204)	$ (218)