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Employee Benefit Plans - Obligations and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Change in plan assets      
Value of plan assets at October 1 $ 341    
Value of plan assets at September 30 337 $ 341  
Amounts recognized in the balance sheet      
Noncurrent benefit assets 33 35  
Noncurrent benefit liabilities (150) (156)  
Pension Plans [Member]      
Change in benefit obligations      
Service cost [1] 6 9 $ 8
Interest cost [2] 10 10 8
Other Postretirement Benefit Plans [Member]      
Change in benefit obligations      
Service cost [1] 1 1 1
Interest cost [2] 2 1 2
Continuing Operations [Member] | Pension Plans [Member]      
Change in benefit obligations      
Benefit obligations at October 1 404 428  
Service cost 5 8  
Interest cost 10 10  
Participant contributions 1 1  
Benefits paid (16) (14)  
Actuarial (gain) loss 65 (14)  
Curtailments (18)    
Foreign currency exchange rate changes (18) (6)  
Other (1) (1)  
Settlements (27) (8)  
Benefit obligations at September 30 405 404 428
Change in plan assets      
Value of plan assets at October 1 341 349  
Actual return on plan assets 50 10  
Employer contributions 5 9  
Participant contributions 1 1  
Benefits paid (16) (14)  
Foreign currency exchange rate changes (15) (6)  
Settlements (27) (8)  
Other (2)    
Value of plan assets at September 30 337 341 349
Unfunded status of the plans (68) (63)  
Amounts recognized in the balance sheet      
Noncurrent benefit assets 33 35  
Current benefit liabilities (3) (3)  
Noncurrent benefit liabilities (98) (95)  
Net amount recognized $ (68) $ (63)  
Weighted-average plan assumptions      
Discount rate 1.96% 2.97%  
Rate of compensation increase 2.52% 2.53%  
Continuing Operations [Member] | Other Postretirement Benefit Plans [Member]      
Change in benefit obligations      
Benefit obligations at October 1 $ 58 $ 62  
Service cost 1 1  
Interest cost 2 1  
Benefits paid (2) (6)  
Actuarial (gain) loss (7)    
Benefit obligations at September 30 52 58 $ 62
Change in plan assets      
Unfunded status of the plans (52) (58)  
Amounts recognized in the balance sheet      
Current benefit liabilities (3) (4)  
Noncurrent benefit liabilities (49) (54)  
Net amount recognized $ (52) $ (58)  
Weighted-average plan assumptions      
Discount rate 3.11% 4.24%  
[1] Service cost was not impacted by new accounting guidance adopted in 2018 and is therefore still classified within the selling, general and administrative expense and cost of sales captions on the Statements of Consolidated Comprehensive Income (Loss).  See Note A for additional information.
[2] These components are now classified within the other net periodic benefit income (costs) caption on the Statements of Consolidated Comprehensive Income (Loss) due to the adoption of new accounting guidance in 2018.  See Note A for additional information.