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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, 2018
Sep. 30, 2017
Sep. 30, 2016
Change in Projected Benefit Obligation      
Actuarial (gain) loss $ (10) $ (420) $ 393
Postretirement Benefits      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 0 0  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 214 242  
Service cost 2 2 2
Interest cost 7 6 6
Plan participant contributions 6 4  
Actuarial (gain) loss 1 (1)  
Amendments made during the year 8 0  
Estimated subsidy received 1 2  
Curtailment 0 0  
Other (1) 0  
Currency translation adjustment (2) 1  
Projected benefit obligation at end of year 196 214 242
Change in Plan Assets      
Fair value of plan assets at beginning of year 177 196  
Actual return on plan assets 6 14  
Adient spin-off impact 0 (13)  
Employer and employee contributions 15 5  
Benefits paid (24) (25)  
Settlement payments 0 0  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 174 177 196
Funded status (22) (37)  
Net amount recognized $ (22) $ (37)  
Weighted Average Assumptions      
Discount rate [1] 3.80% 3.70%  
Defined Benefit Plan, Total Plan Assets $ 174 $ 177  
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 13 0  
Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 177    
Fair value of plan assets at end of year 161 177  
Other noncurrent assets | Postretirement Benefits      
Change in Projected Benefit Obligation      
Benefits and settlements paid (24) (25)  
Cash | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 3    
Fair value of plan assets at end of year 13 3  
Cash | 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 13 0  
Cash | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 3    
Fair value of plan assets at end of year 0 3  
Real Estate | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 10    
Fair value of plan assets at end of year 9 10  
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 10    
Fair value of plan assets at end of year 9 10  
Commodities | Postretirement Benefits      
Change in Plan Assets      
Fair value of plan assets at beginning of year 15    
Fair value of plan assets at end of year 14 15  
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 15    
Fair value of plan assets at end of year 14 15  
Continuing Operations [Member] | Postretirement Benefits      
Change in Plan Assets      
Prepaid benefit cost 61 64  
Accrued benefit liability (83) (101)  
Adient spin-off [Member] | Postretirement Benefits      
Change in Projected Benefit Obligation      
Adient spin-off impact 0 (17)  
UNITED STATES | Pension Plan [Member]      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 3,154 3,382  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 3,419 4,169  
Service cost 15 18 16
Interest cost 105 113 104
Plan participant contributions 0 0  
Actuarial (gain) loss (70) (131)  
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 3,191 3,419 4,169
Change in Plan Assets      
Fair value of plan assets at beginning of year 3,165 3,293  
Actual return on plan assets 152 334  
Adient spin-off impact 0 (16)  
Employer and employee contributions 7 286  
Benefits paid (153) (394)  
Settlement payments (125) (338)  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 3,046 3,165 3,293
Funded status (145) (254)  
Net amount recognized $ (145) $ (254)  
Weighted Average Assumptions      
Discount rate [1] 4.10% 3.80%  
Rate of compensation increase 3.50% 3.20%  
Defined Benefit Plan, Total Plan Assets $ 3,046 $ 3,165  
UNITED STATES | Other noncurrent assets | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Benefits and settlements paid (278) (732)  
UNITED STATES | Cash | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 70    
Fair value of plan assets at end of year 23 70  
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 2 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 68    
Fair value of plan assets at end of year 21 68  
UNITED STATES | Continuing Operations [Member] | Pension Plan [Member]      
Change in Plan Assets      
Prepaid benefit cost 63 46  
Accrued benefit liability (208) (300)  
UNITED STATES | Adient spin-off [Member] | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Adient spin-off impact 0 (18)  
Non-US [Member] | Pension Plan [Member]      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 2,444 2,618  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 2,721 3,522  
Service cost 23 32 30
Interest cost 57 48 44
Plan participant contributions 2 3  
Actuarial (gain) loss (67) (194)  
Amendments made during the year 0 0  
Estimated subsidy received 0 0  
Curtailment (2) (19)  
Other (4) (2)  
Currency translation adjustment (58) 66  
Projected benefit obligation at end of year 2,542 2,721 3,522
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,181 2,536  
Actual return on plan assets 69 94  
Adient spin-off impact 0 (440)  
Employer and employee contributions 48 59  
Benefits paid (88) (86)  
Settlement payments (42) (30)  
Other (2) (2)  
Currency translation adjustment (49) 50  
Fair value of plan assets at end of year 2,117 2,181 $ 2,536
Funded status (425) (540)  
Net amount recognized $ (425) $ (540)  
Weighted Average Assumptions      
Discount rate [1] 2.45% 2.40%  
Rate of compensation increase 2.95% 2.90%  
Defined Benefit Plan, Total Plan Assets $ 2,117 $ 2,181  
Non-US [Member] | Other noncurrent assets | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Benefits and settlements paid (130) (116)  
Non-US [Member] | Hedge Funds | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 112    
Fair value of plan assets at end of year 82 112  
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 112    
Fair value of plan assets at end of year 82 112  
Non-US [Member] | Cash | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 55    
Fair value of plan assets at end of year 44 55  
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 45    
Fair value of plan assets at end of year 43 45  
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 10    
Fair value of plan assets at end of year 1 10  
Non-US [Member] | Real Estate | Pension Plan [Member]      
Change in Plan Assets      
Fair value of plan assets at beginning of year 24    
Fair value of plan assets at end of year 26 24  
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 24    
Fair value of plan assets at end of year 26 24  
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 23 32  
Interest cost 57 48  
Change in Plan Assets      
Prepaid benefit cost 26 27  
Accrued benefit liability (451) (567)  
Non-US [Member] | Adient spin-off [Member] | Pension Plan [Member]      
Change in Projected Benefit Obligation      
Adient spin-off impact $ 0 $ (619)  
[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.