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Restructuring Reserve (Details) - Financial Fitness Program [Member]
$ in Millions
12 Months Ended
Sep. 30, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges $ 73
Payments for Restructuring 4
Restructuring Reserve, Accrual Adjustment 0
Restructuring Reserve 69
Employee Severance [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges 51
Payments for Restructuring 4
Restructuring Reserve, Accrual Adjustment 0
Restructuring Reserve 47
Contract Termination [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges 22
Payments for Restructuring 0
Restructuring Reserve, Accrual Adjustment 0
Restructuring Reserve $ 22