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Retirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Expense Assumptions:      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Pension Plan | United States      
Components of Net Periodic Benefit Cost (Credit):      
Service cost $ 0 $ 0 $ 0
Interest cost 79 78 56
Expected return on plan assets (120) (131) (150)
Net actuarial (gain) loss (9) 28 16
Settlement loss 0 1 1
Amortization of prior service credit 0 0 0
Other 0 0 0
Net periodic benefit cost (credit) $ (50) $ (24) $ (77)
Expense Assumptions:      
Discount rate 5.48% 5.08% 2.52%
Expected return on plan assets 8.50% 8.25% 7.00%
Interest crediting rate 6.00%    
Pension Plan | Foreign Plan      
Components of Net Periodic Benefit Cost (Credit):      
Service cost $ 17 $ 16 $ 20
Interest cost 69 68 39
Expected return on plan assets (72) (77) (81)
Net actuarial (gain) loss 22 86 (116)
Settlement loss 0 6 5
Amortization of prior service credit 0 0 0
Other 1 0 0
Net periodic benefit cost (credit) $ 37 $ 99 $ (133)
Expense Assumptions:      
Discount rate 4.72% 4.36% 1.79%
Expected return on plan assets 5.26% 5.02% 3.70%
Rate of compensation increase 2.90% 3.00% 2.85%
Interest crediting rate 1.63% 1.69% 1.44%
Postretirement Benefits      
Components of Net Periodic Benefit Cost (Credit):      
Service cost $ 0 $ 0 $ 1
Interest cost 4 4 2
Expected return on plan assets (9) (9) (9)
Net actuarial (gain) loss (14) (5) 4
Settlement loss 0 0 0
Amortization of prior service credit (5) (4) (4)
Other 0 0
Net periodic benefit cost (credit) $ (24) $ (14) $ (6)
Expense Assumptions:      
Discount rate 5.42% 4.92% 2.30%
Expected return on plan assets 6.62% 6.64% 5.29%