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v3.26.1

Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized discounts and debt issuance costs | $ (172) | $ (171)
Hedge accounting fair value adjustments | (113) | (50)
Total carrying value of debt | 23,976 | 25,171
Current maturities of debt | 1,559 | 5,569
Long-term debt | 22,417 | 19,602
Senior Notes |  |
Debt Instrument [Line Items] |  |
Senior notes | $ 24,261 | 25,392
Senior Notes | 3.15% Senior Notes due December 2025 | U.S. |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.15% |
Senior notes | $ 0 | 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 | 3.80% Senior Notes due February 2029 | U.S. |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 3.80% |
Senior notes | $ 900 | 0
Effective interest rate (percent) | 3.99% |
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 | 4.10% Senior Notes due February 2031 | U.S. |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.10% |
Senior notes | $ 750 | 0
Effective interest rate (percent) | 4.23% |
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 | 4.40% Senior Notes due February 2033 | U.S. |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.40% |
Senior notes | $ 700 | 0
Effective interest rate (percent) | 4.54% |
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 | 4.70% Senior Notes due February 2036 | U.S. |  |
Debt Instrument [Line Items] |  |
Stated interest rate (percent) | 4.70% |
Senior notes | $ 650 | 0
Effective interest rate (percent) | 4.79% |
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 | $ 1,560 | 1,587
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% |
Senior notes | $ 1,444 | 1,470
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 | $ 1,156 | 1,176
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% |
Senior notes | $ 1,156 | 1,176
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 | $ 751 | 764
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% |
Senior notes | $ 751 | 764
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% |
Senior notes | $ 693 | $ 705
Effective interest rate (percent) | 4.02% |

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