Business Restructuring Reserves and Programs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 4	$ 4	$ 7	$ 11
Restructuring Reserve [Roll Forward]
Prior Period Reclassification Adjustment			5
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			64
Cash payments			(14)
Impact of foreign currency fluctuations			0
Restructuring Reserve, ending balance	51		51
Employee Separation Costs | Fiscal 2020 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			1
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			0
Cash payments			0
Impact of foreign currency fluctuations			(1)
Restructuring Reserve, ending balance	0		0
Employee Separation Costs | Fiscal 2019 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			11
Cash payments			(3)
Impact of foreign currency fluctuations			1
Restructuring Reserve, ending balance	9		9
Employee Separation Costs | Fiscal 2008-2018 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning balance			53
Cash payments			(11)
Impact of foreign currency fluctuations			0
Restructuring Reserve, ending balance	$ 42		$ 42