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Pension and Retirement Plans - Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	$ 1,448	$ 1,591	$ 1,499
Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	1,274	1,525	1,388
Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	175	161	$ 144
Postretirement Benefits | Cash and Cash Equivalents
Retirement Plans [Line Items]
Fair value of plan assets	1	3
Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets	99	89
Postretirement Benefits | Total Investments in the Fair Value Hierarchy
Retirement Plans [Line Items]
Fair value of plan assets	75	69
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	1,044	1,169
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	1,250	1,436
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Cash and Cash Equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	43	23
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Cash and Cash Equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	18	42
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	19	19
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	185	88
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	19	23
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	49	45
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	91	64
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	11	8
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	7	3
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	197	265
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	685	789
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	706	786
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	260	417
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	4	11
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Hedge Fund | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	22
Fair Value, Inputs, Level 1, 2 and 3 | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	100	92
Quoted Prices in Active Markets (Level 1) | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	999	1,144
Quoted Prices in Active Markets (Level 1) | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	212	380
Quoted Prices in Active Markets (Level 1) | Pension Plan | Cash and Cash Equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets (Level 1) | Pension Plan | Cash and Cash Equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	18	42
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	19	19
Quoted Prices in Active Markets (Level 1) | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	5	9
Quoted Prices in Active Markets (Level 1) | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	19	23
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	49	45
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	5	10
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	11	8
Quoted Prices in Active Markets (Level 1) | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets (Level 1) | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	197	265
Quoted Prices in Active Markets (Level 1) | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	10	26
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	704	784
Quoted Prices in Active Markets (Level 1) | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	170	282
Quoted Prices in Active Markets (Level 1) | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	4	11
Quoted Prices in Active Markets (Level 1) | Pension Plan | Hedge Fund | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		0
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	1	3
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Cash and Cash Equivalents
Retirement Plans [Line Items]
Fair value of plan assets	1	3
Quoted Prices in Active Markets (Level 1) | Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Other Observable Inputs (Level 2) | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	45	25
Significant Other Observable Inputs (Level 2) | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	1,038	1,056
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and Cash Equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	43	23
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and Cash Equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	180	79
Significant Other Observable Inputs (Level 2) | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	86	54
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	7	3
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	675	763
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	2	2
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	90	135
Significant Other Observable Inputs (Level 2) | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Other Observable Inputs (Level 2) | Pension Plan | Hedge Fund | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		22
Significant Other Observable Inputs (Level 2) | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	99	89
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash and Cash Equivalents
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets	99	89
Significant Unobservable Inputs (Level 3) | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Cash and Cash Equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Cash and Cash Equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Unobservable Inputs (Level 3) | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Unobservable Inputs (Level 3) | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Unobservable Inputs (Level 3) | Pension Plan | Hedge Fund | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Unobservable Inputs (Level 3) | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Cash and Cash Equivalents
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Unobservable Inputs (Level 3) | Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets		0
Real Estate Investments Measured at Net Asset Value | Pension Plan | Alternative | United States
Retirement Plans [Line Items]
Fair value of plan assets	193	235
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | United States
Retirement Plans [Line Items]
Fair value of plan assets	230	266
Real Estate Investments Measured at Net Asset Value | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	24	89
Real Estate Investments Measured at Net Asset Value | Pension Plan | Due to Broker | United States
Retirement Plans [Line Items]
Fair value of plan assets	$ (19)	$ (79)

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