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Restructuring and Impairment Costs - Changes in Reserve (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance $ 123    
Restructuring reserve ending balance 237 $ 123  
2020 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 205    
Utilized—cash (35)    
Noncash adjustment—other (1)    
Noncash adjustment—underspend (20)    
Restructuring reserve ending balance 169 205  
2019 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 70 105  
Utilized—cash (30) (32)  
Noncash adjustment—other 2 (3)  
Noncash adjustment—underspend (7) (16)  
Restructuring reserve ending balance 35 70 $ 105
2018 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 20 48 71
Utilized—cash (9) (24) (19)
Noncash adjustment—other 1 (3) (4)
Reserve adjustment   9  
Noncash adjustment—underspend (7) (10)  
Restructuring reserve ending balance 5 20 48
2017 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve ending balance 3    
2016 restructuring plan      
Restructuring Reserve [Roll Forward]      
Noncash adjustment—underspend     (20)
Restructuring reserve ending balance 25    
Employee Severance and Termination Benefits | 2020 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 203    
Utilized—cash (35)    
Noncash adjustment—other 0    
Restructuring reserve ending balance 168 203  
Employee Severance and Termination Benefits | 2019 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 69 101  
Utilized—cash (30) (32)  
Noncash adjustment—other 0 0  
Noncash adjustment—underspend (7)    
Restructuring reserve ending balance 32 69 101
Employee Severance and Termination Benefits | 2018 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 24 49 68
Utilized—cash (9) (24) (19)
Noncash adjustment—other 0 0 0
Reserve adjustment   9  
Noncash adjustment—underspend (7) (10)  
Restructuring reserve ending balance 8 24 49
Other | 2020 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 2    
Utilized—cash 0    
Noncash adjustment—other (2)    
Restructuring reserve ending balance 0 2  
Other | 2019 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 3 4  
Utilized—cash 0 0  
Noncash adjustment—other 0 (1)  
Noncash adjustment—underspend 0    
Restructuring reserve ending balance 3 3 4
Other | 2018 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 0 1 3
Utilized—cash 0 0 0
Noncash adjustment—other 0 (1) (2)
Reserve adjustment   0  
Noncash adjustment—underspend 0 0  
Restructuring reserve ending balance 0 0 1
Currency Translation | 2020 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance 0    
Utilized—cash 0    
Noncash adjustment—other 1    
Restructuring reserve ending balance 1 0  
Currency Translation | 2019 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance (2) 0  
Utilized—cash 0 0  
Noncash adjustment—other 2 (2)  
Noncash adjustment—underspend 0    
Restructuring reserve ending balance 0 (2) 0
Currency Translation | 2018 restructuring plan      
Restructuring Reserve [Roll Forward]      
Restructuring reserve beginning balance (4) (2) 0
Utilized—cash 0 0 0
Noncash adjustment—other 1 (2) (2)
Reserve adjustment   0  
Noncash adjustment—underspend 0 0  
Restructuring reserve ending balance $ (3) $ (4) $ (2)