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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Pension Plan | United States      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation $ 1,564 $ 1,822  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 1,822 2,629  
Service cost 0 0 $ 0
Interest cost 78 56 47
Plan participant contributions 0 0  
Actuarial gain (37) (587)  
Benefits and settlements paid (299) (276)  
Other 0 0  
Currency translation adjustment 0 0  
Projected benefit obligation at end of year 1,564 1,822 2,629
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,730 2,459  
Actual return on plan assets 66 (454)  
Employer and employee contributions 3 1  
Benefits paid (85) (85)  
Settlement payments (215) (191)  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 1,499 1,730 2,459
Funded status (65) (92)  
Prepaid benefit cost 1 37  
Accrued benefit liability (66) (129)  
Net amount recognized $ (65) $ (92)  
Weighted Average Assumptions      
Discount rate 5.48% 5.08%  
Pension Plan | Foreign Plan      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation $ 1,424 $ 1,417  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 1,471 2,625  
Service cost 16 20 27
Interest cost 68 39 32
Plan participant contributions 3 2  
Actuarial gain (62) (651)  
Benefits and settlements paid (126) (166)  
Other (3) (3)  
Currency translation adjustment 106 (395)  
Projected benefit obligation at end of year 1,473 1,471 2,625
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,433 2,344  
Actual return on plan assets (77) (459)  
Employer and employee contributions 55 94  
Benefits paid (61) (74)  
Settlement payments (65) (92)  
Other (2) (2)  
Currency translation adjustment 105 (378)  
Fair value of plan assets at end of year 1,388 1,433 2,344
Funded status (85) (38)  
Prepaid benefit cost 97 151  
Accrued benefit liability (182) (189)  
Net amount recognized $ (85) $ (38)  
Weighted Average Assumptions      
Discount rate 4.72% 4.36%  
Rate of compensation increase 2.90% 3.00%  
Interest crediting rate 1.63% 1.69%  
Postretirement Benefits      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation $ 76 $ 89  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 89 123  
Service cost 0 1 1
Interest cost 4 2 2
Plan participant contributions 3 3  
Actuarial gain (7) (25)  
Benefits and settlements paid (12) (14)  
Other 0 0  
Currency translation adjustment 0 (1)  
Projected benefit obligation at end of year 77 89 123
Change in Plan Assets      
Fair value of plan assets at beginning of year 144 172  
Actual return on plan assets 7 (20)  
Employer and employee contributions 5 6  
Benefits paid (12) (14)  
Settlement payments 0 0  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 144 144 $ 172
Funded status 67 55  
Prepaid benefit cost 101 95  
Accrued benefit liability (34) (40)  
Net amount recognized $ 67 $ 55  
Weighted Average Assumptions      
Discount rate 5.42% 4.92%