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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, 2019
Sep. 30, 2018
Sep. 30, 2017
Postretirement Benefits      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation $ 0 $ 0  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 196 214  
Service cost 1 2 $ 2
Interest cost 6 7 6
Plan participant contributions 6 6  
Actuarial (gain) loss 15 1  
Amendments made during the year (19) (8)  
Estimated subsidy received 1 1  
Curtailment 0 0  
Other 0 (1)  
Currency translation adjustment 0 (2)  
Projected benefit obligation at end of year 174 196 214
Change in Plan Assets      
Fair value of plan assets at beginning of year 174 177  
Actual return on plan assets 7 6  
Employer and employee contributions 9 15  
Benefits paid (23) (24)  
Settlement payments 0 0  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 163 174 177
Funded status (11) (22)  
Net amount recognized $ (11) $ (22)  
Weighted Average Assumptions      
Discount rate [1] 2.90% 3.80%  
Defined Benefit Plan, Total Plan Assets $ 163 $ 174  
Postretirement Benefits | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 13    
Fair value of plan assets at end of year 6 13  
Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 161    
Fair value of plan assets at end of year 157 161  
Other noncurrent assets | Postretirement Benefits      
Change in Projected Benefit Obligation      
Benefits and settlements paid (23) (24)  
Power Solutions | Postretirement Benefits      
Change in Projected Benefit Obligation      
Power Solutions divestiture (9) 0  
Change in Plan Assets      
Power Solutions divestiture (4) 0  
Business Divestitures, Not Specific | Postretirement Benefits      
Change in Projected Benefit Obligation      
Power Solutions divestiture 0 0  
Change in Plan Assets      
Power Solutions divestiture 0 0  
Cash | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 13    
Fair value of plan assets at end of year 6 13  
Cash | Postretirement Benefits | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 13    
Fair value of plan assets at end of year 6 13  
Cash | 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  
Real Estate | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 9    
Fair value of plan assets at end of year 11 9  
Real Estate | 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  
Real Estate | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 9    
Fair value of plan assets at end of year 11 9  
Commodities | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 14    
Fair value of plan assets at end of year 13 14  
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 14    
Fair value of plan assets at end of year 13 14  
Continuing Operations [Member] | Postretirement Benefits      
Change in Plan Assets      
Prepaid benefit cost 66 61  
Accrued benefit liability (77) (83)  
Discontinued Operations | Postretirement Benefits      
Change in Plan Assets      
Accrued benefit liability 0 0  
United States | Pension Plan [Member]      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 3,115 3,154  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 3,191 3,419  
Service cost 8 15 18
Interest cost 108 105 113
Plan participant contributions 0 0  
Actuarial (gain) loss 441 (70)  
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 3,115 3,191 3,419
Change in Plan Assets      
Fair value of plan assets at beginning of year 3,046 3,165  
Actual return on plan assets 266 152  
Employer and employee contributions 38 7  
Benefits paid (136) (153)  
Settlement payments (107) (125)  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 2,736 3,046 3,165
Funded status (379) (145)  
Net amount recognized $ (379) $ (145)  
Weighted Average Assumptions      
Discount rate [1] 2.95% 4.10%  
Rate of compensation increase   3.50%  
Defined Benefit Plan, Total Plan Assets $ 2,736 $ 3,046  
United States | Other noncurrent assets | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Benefits and settlements paid (243) (278)  
United States | Power Solutions | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Power Solutions divestiture (390) 0  
Change in Plan Assets      
Power Solutions divestiture (371) 0  
United States | Business Divestitures, Not Specific | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Power Solutions divestiture 0 0  
Change in Plan Assets      
Power Solutions divestiture 0 0  
United States | Cash | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 23    
Fair value of plan assets at end of year 55 23  
United States | Cash | Pension Plan [Member] | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 2    
Fair value of plan assets at end of year 24 2  
United States | Cash | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 21    
Fair value of plan assets at end of year 31 21  
United States | Continuing Operations [Member] | Pension Plan [Member]      
Change in Plan Assets      
Prepaid benefit cost 30 63  
Accrued benefit liability (409) (156)  
United States | Discontinued Operations | Pension Plan [Member]      
Change in Plan Assets      
Accrued benefit liability 0 (52)  
Non-US [Member] | Pension Plan [Member]      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 2,549 2,444  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 2,542 2,721  
Service cost 22 23 32
Interest cost 54 57 48
Plan participant contributions 2 2  
Actuarial (gain) loss 337 (67)  
Amendments made during the year 26 0  
Estimated subsidy received 0 0  
Curtailment 0 (2)  
Other (2) (4)  
Currency translation adjustment (109) (58)  
Projected benefit obligation at end of year 2,652 2,542 2,721
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,117 2,181  
Actual return on plan assets 203 69  
Employer and employee contributions 50 48  
Benefits paid (76) (88)  
Settlement payments (50) (42)  
Other (2) (2)  
Currency translation adjustment (95) (49)  
Fair value of plan assets at end of year 2,098 2,117 $ 2,181
Funded status (554) (425)  
Net amount recognized $ (554) $ (425)  
Weighted Average Assumptions      
Discount rate [1] 1.50% 2.45%  
Rate of compensation increase 2.80% 2.95%  
Defined Benefit Plan, Total Plan Assets $ 2,098 $ 2,117  
Non-US [Member] | Other noncurrent assets | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Benefits and settlements paid (126) (130)  
Non-US [Member] | Power Solutions | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Power Solutions divestiture (86) 0  
Change in Plan Assets      
Power Solutions divestiture (45) 0  
Non-US [Member] | Business Divestitures, Not Specific | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Power Solutions divestiture (8) 0  
Change in Plan Assets      
Power Solutions divestiture (4) 0  
Non-US [Member] | Hedge Funds | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 82    
Fair value of plan assets at end of year 69 82  
Non-US [Member] | Hedge Funds | Pension Plan [Member] | 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  
Non-US [Member] | Hedge Funds | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 82    
Fair value of plan assets at end of year 69 82  
Non-US [Member] | Cash | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 44    
Fair value of plan assets at end of year 174 44  
Non-US [Member] | Cash | Pension Plan [Member] | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 43    
Fair value of plan assets at end of year 174 43  
Non-US [Member] | Cash | Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 1    
Fair value of plan assets at end of year 0 1  
Non-US [Member] | Real Estate | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 26    
Fair value of plan assets at end of year 31 26  
Non-US [Member] | Real Estate | Pension Plan [Member] | Fair Value, Inputs, Level 1      
Change in Plan Assets      
Fair value of plan assets at beginning of year 26    
Fair value of plan assets at end of year 31 26  
Non-US [Member] | Real Estate | Pension Plan [Member] | 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  
Non-US [Member] | Continuing Operations [Member] | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Service cost 22 23  
Interest cost 54 57  
Change in Plan Assets      
Prepaid benefit cost 25 26  
Accrued benefit liability (579) (409)  
Non-US [Member] | Discontinued Operations | Pension Plan [Member]      
Change in Plan Assets      
Accrued benefit liability $ 0 $ (42)  
[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.