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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Pension Plan | United States      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation $ 1,603 $ 1,564  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 1,564 1,822  
Service cost 0 0 $ 0
Interest cost 79 78 56
Plan participant contributions 0 0  
Actuarial loss (gain) 104 (37)  
Benefits and settlements paid (144) (299)  
Other 0 0  
Currency translation adjustment 0 0  
Projected benefit obligation at end of year 1,603 1,564 1,822
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,499 1,730  
Actual return on plan assets 234 66  
Employer and employee contributions 2 3  
Benefits paid (144) (85)  
Settlement payments 0 (215)  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 1,591 1,499 1,730
Funded status (12) (65)  
Net amount recognized $ (12) $ (65)  
Weighted Average Assumptions      
Discount rate 4.60% 5.48%  
Pension Plan | United States | Other noncurrent assets      
Change in Plan Assets      
Assets $ 2 $ 1  
Pension Plan | United States | Noncurrent assets held for sale      
Change in Plan Assets      
Assets 0 0  
Pension Plan | United States | Accrued compensation and benefits      
Change in Plan Assets      
Liabilities (2) (3)  
Pension Plan | United States | Pension and postretirement benefit obligations      
Change in Plan Assets      
Liabilities (12) (63)  
Pension Plan | United States | Noncurrent liabilities held for sale      
Change in Plan Assets      
Liabilities 0 0  
Pension Plan | Foreign Plan      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 1,563 1,424  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 1,473 1,471  
Service cost 17 16 20
Interest cost 69 68 39
Plan participant contributions 3 3  
Actuarial loss (gain) 84 (62)  
Benefits and settlements paid (132) (126)  
Other (3) (3)  
Currency translation adjustment 106 106  
Projected benefit obligation at end of year 1,617 1,473 1,471
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,388 1,433  
Actual return on plan assets 137 (77)  
Employer and employee contributions 26 55  
Benefits paid (67) (61)  
Settlement payments (65) (65)  
Other 1 (2)  
Currency translation adjustment 105 105  
Fair value of plan assets at end of year 1,525 1,388 1,433
Funded status (92) (85)  
Net amount recognized $ (92) $ (85)  
Weighted Average Assumptions      
Discount rate 4.35% 4.72%  
Rate of compensation increase 3.01% 2.90%  
Interest crediting rate 1.58% 1.63%  
Pension Plan | Foreign Plan | Other noncurrent assets      
Change in Plan Assets      
Assets $ 62 $ 62  
Pension Plan | Foreign Plan | Noncurrent assets held for sale      
Change in Plan Assets      
Assets 52 35  
Pension Plan | Foreign Plan | Accrued compensation and benefits      
Change in Plan Assets      
Liabilities (12) (12)  
Pension Plan | Foreign Plan | Pension and postretirement benefit obligations      
Change in Plan Assets      
Liabilities (166) (143)  
Pension Plan | Foreign Plan | Noncurrent liabilities held for sale      
Change in Plan Assets      
Liabilities (28) (27)  
Postretirement Benefits      
Retirement Plans [Line Items]      
Accumulated Benefit Obligation 73 76  
Change in Projected Benefit Obligation      
Projected benefit obligation at beginning of year 77 89  
Service cost 0 0 1
Interest cost 4 4 2
Plan participant contributions 2 3  
Actuarial loss (gain) 4 (7)  
Benefits and settlements paid (13) (12)  
Other (1) 0  
Currency translation adjustment 0 0  
Projected benefit obligation at end of year 73 77 89
Change in Plan Assets      
Fair value of plan assets at beginning of year 144 144  
Actual return on plan assets 26 7  
Employer and employee contributions 4 5  
Benefits paid (13) (12)  
Settlement payments 0 0  
Other 0 0  
Currency translation adjustment 0 0  
Fair value of plan assets at end of year 161 144 $ 144
Funded status 88 67  
Net amount recognized $ 88 $ 67  
Weighted Average Assumptions      
Discount rate 4.50% 5.42%  
Postretirement Benefits | Other noncurrent assets      
Change in Plan Assets      
Assets $ 118 $ 101  
Postretirement Benefits | Noncurrent assets held for sale      
Change in Plan Assets      
Assets 0 0  
Postretirement Benefits | Accrued compensation and benefits      
Change in Plan Assets      
Liabilities (2) (2)  
Postretirement Benefits | Pension and postretirement benefit obligations      
Change in Plan Assets      
Liabilities (28) (32)  
Postretirement Benefits | Noncurrent liabilities held for sale      
Change in Plan Assets      
Liabilities $ 0 $ 0