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Retirement Plans Accumulated Benefit Obligations and Reconciliations of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Pension Plan | Foreign Plan      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation $ 2,540 $ 2,627  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 2,726 2,652  
Service cost 27 25 $ 22
Interest cost 32 36 54
Plan participant contributions 3 3  
Actuarial (gain) loss (103) 7  
Amendments made during the year (6) 0  
Estimated subsidy received 0 0  
Curtailment (3) (8)  
Other (2) 4  
Currency translation adjustment 75 118  
Projected benefit obligation at end of year 2,625 2,726 2,652
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,213 2,098  
Actual return on plan assets 125 75  
Employer and employee contributions 65 56  
Benefits paid (79) (73)  
Settlement payments (45) (36)  
Other (1) 0  
Currency translation adjustment 66 93  
Fair value of plan assets at end of year 2,344 2,213 2,098
Funded status (281) (513)  
Net amount recognized $ (281) $ (513)  
Weighted Average Assumptions      
Discount rate [1] 1.80% 1.35%  
Rate of compensation increase 2.85% 2.75%  
Interest Crediting Rate 1.45% 1.50%  
Defined Benefit Plan, Total Plan Assets $ 2,344 $ 2,213  
Pension Plan | United States      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 2,629 3,217  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 3,217 3,115  
Service cost 0 0 8
Interest cost 47 67 108
Plan participant contributions 0 0  
Actuarial (gain) loss (52) 298  
Amendments made during the year 0 0  
Estimated subsidy received 0 0  
Curtailment 0 0  
Other 0 0  
Currency translation adjustment 0 0  
Projected benefit obligation at end of year 2,629 3,217 3,115
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,706 2,736  
Actual return on plan assets 333 228  
Employer and employee contributions 3 5  
Benefits paid (108) (112)  
Settlement payments (475) (151)  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 2,459 2,706 2,736
Funded status (170) (511)  
Net amount recognized $ (170) $ (511)  
Weighted Average Assumptions      
Discount rate [1] 2.50% 2.25%  
Defined Benefit Plan, Total Plan Assets $ 2,459 $ 2,706  
Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan      
Change in Plan Assets      
Fair value of plan assets at beginning of year 665    
Fair value of plan assets at end of year 615 665  
Pension Plan | Fair Value, Inputs, Level 1 | United States      
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,251    
Fair value of plan assets at end of year 1,993 2,251  
Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan      
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,532    
Fair value of plan assets at end of year 1,624 1,532  
Pension Plan | Fair Value, Inputs, Level 2 [Member] | United States      
Change in Plan Assets      
Fair value of plan assets at beginning of year 259    
Fair value of plan assets at end of year 263 259  
Postretirement Benefits      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 0 0  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 146 174  
Service cost 1 1 1
Interest cost 2 4 6
Plan participant contributions 3 4  
Actuarial (gain) loss (13) (3)  
Amendments made during the year 0 (13)  
Estimated subsidy received 0 1  
Curtailment 0 0  
Other 0 0  
Currency translation adjustment 1 (1)  
Projected benefit obligation at end of year 123 146 174
Change in Plan Assets      
Fair value of plan assets at beginning of year 153 163  
Actual return on plan assets 30 4  
Employer and employee contributions 6 7  
Benefits paid (17) (21)  
Settlement payments 0 0  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 172 153 $ 163
Funded status 49 7  
Net amount recognized $ 49 $ 7  
Weighted Average Assumptions      
Discount rate [1] 2.30% 1.90%  
Defined Benefit Plan, Total Plan Assets $ 172 $ 153  
Postretirement Benefits | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 5    
Fair value of plan assets at end of year 5 5  
Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 148    
Fair value of plan assets at end of year 167 148  
Other noncurrent assets | Pension Plan | Foreign Plan      
Change in Projected Benefit Obligation      
Benefits and settlements paid (124) (109)  
Other noncurrent assets | Pension Plan | United States      
Change in Projected Benefit Obligation      
Benefits and settlements paid (583) (263)  
Other noncurrent assets | Postretirement Benefits      
Change in Projected Benefit Obligation      
Benefits and settlements paid (17) (21)  
Business Divestitures, Not Specific | Pension Plan | Foreign Plan      
Change in Projected Benefit Obligation      
Power Solutions divestiture 0 (2)  
Business Divestitures, Not Specific | Pension Plan | United States      
Change in Projected Benefit Obligation      
Power Solutions divestiture 0 0  
Business Divestitures, Not Specific | Postretirement Benefits      
Change in Projected Benefit Obligation      
Power Solutions divestiture 0 0  
Hedge Funds | Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan      
Change in Plan Assets      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Hedge Funds | Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan      
Change in Plan Assets      
Fair value of plan assets at beginning of year 49    
Fair value of plan assets at end of year 27 49  
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan      
Change in Plan Assets      
Fair value of plan assets at beginning of year 178    
Fair value of plan assets at end of year 151 178  
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 1 | United States      
Change in Plan Assets      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan      
Change in Plan Assets      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 2 [Member] | United States      
Change in Plan Assets      
Fair value of plan assets at beginning of year 36    
Fair value of plan assets at end of year 75 36  
Cash and cash equivalents | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 5    
Fair value of plan assets at end of year 5 5  
Cash and cash equivalents | Postretirement Benefits | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 5    
Fair value of plan assets at end of year 5 5  
Cash and cash equivalents | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Commodities | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 12    
Fair value of plan assets at end of year 17 12  
Commodities | Postretirement Benefits | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Commodities | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 12    
Fair value of plan assets at end of year 17 12  
Continuing Operations [Member] | Pension Plan | Foreign Plan      
Change in Projected Benefit Obligation      
Service cost 27 25  
Interest cost 32 36  
Change in Plan Assets      
Prepaid benefit cost 79 29  
Accrued benefit liability (360) (542)  
Continuing Operations [Member] | Pension Plan | United States      
Change in Plan Assets      
Prepaid benefit cost 44 32  
Accrued benefit liability (214) (543)  
Continuing Operations [Member] | Postretirement Benefits      
Change in Plan Assets      
Prepaid benefit cost 107 78  
Accrued benefit liability $ (58) $ (71)  
[1] The Company considers the expected benefit payments on a plan-by-plan basis when setting assumed discount rates. As a result, the Company uses different discount rates for each plan depending on the plan jurisdiction, the demographics of participants and the expected timing of benefit payments. For the U.S. pension and postretirement plans, the Company uses a discount rate provided by an independent third party calculated based on an appropriate mix of high quality bonds. For the non-U.S. pension and postretirement plans, the Company consistently uses the relevant country specific benchmark indices for determining the various discount rates. The Company has elected to utilize a full yield curve approach in the estimation of service and interest components of net periodic benefit cost (credit) for pension and other postretirement for plans that utilize a yield curve approach. The full yield curve approach applies the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows.