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Long-Term Debt (Details) € in Millions, $ in Millions	12 Months Ended
Long-Term Debt (Details) € in Millions, $ in Millions	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 4,792		$ 3,825
Less: Current maturities	515		688
Total, net	4,277		3,137
Long-term debt maturing during year two	314
Long-term debt maturing during year three	533
Long-term debt maturing during year four	498
Long-term debt maturing during year five	544
Interest paid related to short-term borrowings and long-term debt	195		193	$ 192
5.25% notes due October 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	0		400
Repayments of debt	$ 400
Notes interest rate, percentage	5.25%
5.0% notes due April 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 0		250
Repayments of debt	$ 250
Notes interest rate, percentage	5.00%
4.875% notes due October 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500		500
4.25% notes due November 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	300		300
2.625% notes due December 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	500		500
2.625% notes due February 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	500		500
0.375% notes due May 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	545		0
3.15% notes Due June 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	500		500
1.25% notes due October 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	545		0
2.0% notes due October 2029 [Member]
Debt Instrument [Line Items]
Long-term debt	545		0
6.0% notes due August 2032 [Member]
Debt Instrument [Line Items]
Long-term debt	250		250
6.125% notes due April 2039 [Member]
Debt Instrument [Line Items]
Long-term debt	250		250
5.25% notes due November 2039 [Member]
Debt Instrument [Line Items]
Long-term debt	300		300
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 57		75
5.375% notes due October 2017 [Member]
Debt Instrument [Line Items]
Repayments of debt			$ 250
Notes interest rate, percentage			5.375%
1.25 Percent Notes Due October 2025 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Notes interest rate, percentage	1.25%
Proceeds from issuance of debt \| €		€ 500
2.0 Percent Notes Due October 2029 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Notes interest rate, percentage	2.00%
Proceeds from issuance of debt \| €		500
0.375 Percent Notes Due May 2024 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Notes interest rate, percentage	0.375%
Proceeds from issuance of debt \| €		€ 500