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Debt (Details) - USD ($) $ in Millions	Jun. 30, 2025	May 31, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Unamortized discounts and debt issuance costs	$ (188)		$ (142)
Hedge accounting fair value adjustments	(65)		(133)
Total carrying value of debt	25,138		20,836
Current maturities of debt	5,548		0
Long-term debt	19,590		20,836
Senior Notes
Debt Instrument [Line Items]
Senior notes	$ 25,391		21,111
Senior Notes \| 3.15% Senior Notes due December 2025 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	3.15%
Senior notes	$ 4,000		4,000
Effective interest rate (percent)	3.26%
Senior Notes \| 1.90% Senior Notes due April 2027 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	1.90%
Senior notes	$ 1,500		1,500
Effective interest rate (percent)	2.02%
Senior Notes \| 0.75% Senior Notes due August 2027 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	0.75%
Senior notes	$ 500		500
Effective interest rate (percent)	0.84%
Senior Notes \| 2.75% Senior Notes due September 2027 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	2.75%
Senior notes	$ 750		750
Effective interest rate (percent)	2.91%
Senior Notes \| 2.05% Senior Notes due April 2030 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	2.05%
Senior notes	$ 1,500		1,500
Effective interest rate (percent)	2.13%
Senior Notes \| 1.10% Senior Notes due February 2031 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	1.10%
Senior notes	$ 1,000		1,000
Effective interest rate (percent)	1.20%
Senior Notes \| 4.15% Senior Notes due December 2035 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	4.15%
Senior notes	$ 1,500		1,500
Effective interest rate (percent)	4.23%
Senior Notes \| 2.70% Senior Notes due April 2040 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	2.70%
Senior notes	$ 1,000		1,000
Effective interest rate (percent)	2.80%
Senior Notes \| 4.30% Senior Notes due December 2045 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	4.30%
Senior notes	$ 3,500		3,500
Effective interest rate (percent)	4.37%
Senior Notes \| 3.65% Senior Notes due September 2047 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	3.65%
Senior notes	$ 750		750
Effective interest rate (percent)	3.73%
Senior Notes \| 2.00% Senior Notes due August 2050 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	2.00%
Senior notes	$ 1,750		1,750
Effective interest rate (percent)	2.09%
Senior Notes \| 1.50% Senior Notes due June 2026 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	1.50%
Senior notes	$ 1,587		1,513
Effective interest rate (percent)	1.71%
Senior Notes \| 2.25% Senior Notes due May 2028 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	2.25%	2.25%
Senior notes	$ 1,469		0
Effective interest rate (percent)	2.57%
Senior Notes \| 2.00% Senior Notes due June 2029 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	2.00%
Senior notes	$ 1,176		1,120
Effective interest rate (percent)	2.13%
Senior Notes \| 3.125% Senior Notes due May 2033 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	3.125%	3.125%
Senior notes	$ 1,176		0
Effective interest rate (percent)	3.20%
Senior Notes \| 2.375% Senior Notes due June 2034 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	2.375%
Senior notes	$ 764		728
Effective interest rate (percent)	2.53%
Senior Notes \| 3.50% Senior Notes due May 2037 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	3.50%	3.50%
Senior notes	$ 764		0
Effective interest rate (percent)	3.62%
Senior Notes \| 3.875% Senior Notes due May 2044 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	3.875%	3.875%
Senior notes	$ 705		$ 0
Effective interest rate (percent)	4.02%