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Restructuring and Related Charges Restructuring Reserve (Details) - Financial Fitness Program [Member]
$ in Millions
6 Months Ended
Mar. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]  
Liability as of September 30, 2017 $ 69
Restructuring charges 4
Payments 43
Other 0
Liability as of March 31, 2018 30
Severance and employee related costs  
Restructuring Cost and Reserve [Line Items]  
Liability as of September 30, 2017 47
Restructuring charges 4
Payments 24
Other 0
Liability as of March 31, 2018 27
Contract termination  
Restructuring Cost and Reserve [Line Items]  
Liability as of September 30, 2017 22
Restructuring charges 0
Payments 19
Other 0
Liability as of March 31, 2018 $ 3