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Retirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
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 56 47 67
Expected return on plan assets (150) (171) (180)
Net actuarial (gain) loss 16 (214) 244
Amortization of prior service cost (credit) 0 0 0
Curtailment gain 0 0 0
Settlement (gain) loss 1 0 6
Special termination benefit cost $ 0 $ 0 $ 0
Expense Assumptions:      
Discount rate 2.52% 2.25% 2.95%
Expected return on plan assets 7.00% 6.50% 6.90%
Pension Plan | Foreign Plan      
Components of Net Periodic Benefit Cost (Credit):      
Service cost $ 20 $ 27 $ 25
Interest cost 39 32 36
Expected return on plan assets (81) (112) (111)
Net actuarial (gain) loss (116) (115) 43
Amortization of prior service cost (credit) 0 1 1
Curtailment gain 0 (3) (8)
Settlement (gain) loss 5 (1) 0
Special termination benefit cost $ 0 $ 2 $ 0
Expense Assumptions:      
Discount rate 1.79% 1.35% 1.50%
Expected return on plan assets 3.70% 4.90% 5.20%
Rate of compensation increase 2.85% 2.75% 2.80%
Interest crediting rate 1.44% 1.50% 1.50%
Postretirement Benefits      
Components of Net Periodic Benefit Cost (Credit):      
Service cost $ 1 $ 1 $ 1
Interest cost 2 2 4
Expected return on plan assets (9) (8) (9)
Net actuarial (gain) loss 4 (35) 2
Amortization of prior service cost (credit) (4) (4) (3)
Curtailment gain 0 0 0
Settlement (gain) loss 0 0 0
Special termination benefit cost $ 0 $ 0 $ 0
Expense Assumptions:      
Discount rate 2.30% 1.90% 2.65%
Expected return on plan assets 5.29% 5.30% 5.70%
Continuing Operations | Pension Plan | United States      
Components of Net Periodic Benefit Cost (Credit):      
Net periodic benefit cost (credit) included in continuing operations $ (77) $ (338) $ 137
Continuing Operations | Pension Plan | Foreign Plan      
Components of Net Periodic Benefit Cost (Credit):      
Net periodic benefit cost (credit) included in continuing operations (133) (169) (14)
Continuing Operations | Postretirement Benefits      
Components of Net Periodic Benefit Cost (Credit):      
Net periodic benefit cost (credit) included in continuing operations $ (6) $ (44) $ (5)