Debt - Senior Notes (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Senior notes	$ 22,945
Unamortized discounts and debt issuance costs	(173)	$ (161)
Hedge accounting fair value adjustments	(322)	138
Total carrying value of debt	22,450	20,977
Current maturities of debt	2,250	999
Long-term debt	20,200	19,978
Senior Notes
Debt Instrument [Line Items]
Total debt	22,945	21,000
Total carrying value of debt	$ 22,500	21,000
Senior Notes \| 2.15% Senior Notes due September 2022 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	2.15%
Senior notes	$ 0	1,000
Effective interest rate (percent)	2.30%
Senior Notes \| 2.80% Senior Notes due December 2022 \| U.S.
Debt Instrument [Line Items]
Stated interest rate (percent)	2.80%
Senior notes	$ 2,250	2,250
Effective interest rate (percent)	2.89%
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	$ 1,325	0
Effective interest rate (percent)	1.71%
Senior Notes \| 2.00% Senior Notes due June 2029 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	2.00%
Senior notes	$ 982	0
Effective interest rate (percent)	2.13%
Senior Notes \| 2.375% Senior Notes due June 2034 \| Europe
Debt Instrument [Line Items]
Stated interest rate (percent)	2.375%
Senior notes	$ 638	$ 0
Effective interest rate (percent)	2.53%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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