Contractual interest rate for funds borrowed, under the debt agreement.

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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, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 6,648	$ 4,792
Less: Current maturities	322	515
Total, net	6,326	4,277
Long-term debt maturing during year two	525
Long-term debt maturing during year three	511
Long-term debt maturing during year four	582
Long-term debt maturing during year five	497
Interest paid related to long-term debt	163	195		$ 193
5.25% notes due October 2018 [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 400
Notes interest rate, percentage		5.25%
4.875% notes due October 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	0	$ 500
Repayments of Debt	$ 500
Notes interest rate, percentage	4.875%
5.0% notes due April 2019 [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 250
Notes interest rate, percentage		5.00%
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	586	545
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	586	545
0.875% Notes Due October 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 750	0
Notes interest rate, percentage	0.875%
Proceeds from issuance of debt	$ 750
1.8% Notes Due October 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500	0
Notes interest rate, percentage	1.80%
Proceeds from issuance of debt	$ 500
2.0% notes due October 2029 [Member]
Debt Instrument [Line Items]
Long-term debt	586	545
1.95% Notes Due October 2030 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500	0
Notes interest rate, percentage	1.95%
Proceeds from issuance of debt	$ 500
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
2.75% Notes Due October 2050 [Member]
Debt Instrument [Line Items]
Long-term debt	$ 500	0
Notes interest rate, percentage	2.75%
Proceeds from issuance of debt	$ 500
Other [Member]
Debt Instrument [Line Items]
Long-term debt	$ 40	$ 57
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