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Income Taxes Income Taxes, Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax, Continuing Operations [Line Items]      
Operating Loss Carryforwards $ 24,300    
Income from Continuing Operations before Income Taxes, Domestic 773 $ 868 $ 943
Net Operating Loss Carry Forwards That Will Expire 13,500    
Tax Credit Carryforward, Amount $ 624    
Earliest Tax Year [Member]      
Income Tax, Continuing Operations [Line Items]      
Expiration period of net operating loss carryforwards Dec. 31, 2019    
Tax Credit Carryforward, Expiration Date Dec. 31, 2020    
Latest Tax Year [Member]      
Income Tax, Continuing Operations [Line Items]      
Expiration period of net operating loss carryforwards Dec. 31, 2038    
Tax Credit Carryforward, Expiration Date Dec. 31, 2024