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Leases - Narrative (Details) - USD ($)
$ in Millions
Oct. 01, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Operating lease right-of-use assets   $ 334      
Operating lease, liability   339      
Stockholders' equity, including portion attributable to noncontrolling interest   $ 1,535 $ 2,189 $ 2,717 $ 4,592
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member        
Operating lease, weighted average remaining lease term   5 years      
Operating lease, weighted average discount rate, percent   5.90%      
Cumulative effect, period of adoption, adjustment          
Operating lease right-of-use assets     380    
Operating lease, liability     384    
Stockholders' equity, including portion attributable to noncontrolling interest     $ (4)