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Stock-based Compensation (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 30, 2019
USD ($)
Plan
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jan. 23, 2013
shares
Stock Based Compensation Activity [Line Items]        
Shares authorized for issuance under 2012 Plan (in shares) | shares       76
Shares available for issuance under the 2012 Plan (in shares) | shares 34      
Number of share-based compensation plans | Plan 4      
Compensation cost charged against income from share-based compensation plans $ 103 $ 89 $ 122  
Total income tax benefit recognized for share-based compensation arrangements 26 22 48  
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 6 3 4  
Proceeds from the exercise of stock options $ 171 $ 66 $ 157  
Employee Stock Option        
Stock Based Compensation Activity [Line Items]        
Expiration period for stock options 10 years      
Weighted-average grant-date fair value of options granted | $ / shares $ 5.56 $ 7.04 $ 7.81  
Total intrinsic value of options exercised $ 73 $ 38 $ 81  
Proceeds from the exercise of stock options 171 66 157  
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted $ 8      
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 9 months 18 days      
Stock Appreciation Rights (SARs)        
Stock Based Compensation Activity [Line Items]        
Payments towards exercise of SARs granted $ 3 $ 3 $ 4  
Restricted (Nonvested) Stock        
Stock Based Compensation Activity [Line Items]        
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted $ 72      
Weighted average period over which unrecognized compensation cost is expected to be recognized 2 years 1 month 6 days      
Performance Shares        
Stock Based Compensation Activity [Line Items]        
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted $ 31      
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 9 months 18 days      
Maximum | Employee Stock Option        
Stock Based Compensation Activity [Line Items]        
Vesting period 3 years      
Maximum | Restricted (Nonvested) Stock        
Stock Based Compensation Activity [Line Items]        
Vesting period 3 years