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Debt - Summary of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized discounts and debt issuance costs | $ (151) | $ (159)
Hedge accounting fair value adjustments | (238) | (314)
Total carrying value of debt | 20,603 | 20,463
Current maturities of debt | 0 | 0
Long-term debt | 20,603 | 20,463
Senior Notes |  |
Debt Instrument [Line Items] |  |
Total debt | 20,992 | 20,936
Senior Notes | 3.15% Senior Notes due December 2025 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 4,000 | 4,000
Effective interest rate (percent) | 3.26% |
Stated interest rate (percent) | 3.15% |
Senior Notes | 1.90% Senior Notes due April 2027 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,500 | 1,500
Effective interest rate (percent) | 2.02% |
Stated interest rate (percent) | 1.90% |
Senior Notes | 0.75% Senior Notes due August 2027 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 500 | 500
Effective interest rate (percent) | 0.84% |
Stated interest rate (percent) | 0.75% |
Senior Notes | 2.75% Senior Notes due September 2027 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 750 | 750
Effective interest rate (percent) | 2.91% |
Stated interest rate (percent) | 2.75% |
Senior Notes | 2.05% Senior Notes due April 2030 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,500 | 1,500
Effective interest rate (percent) | 2.13% |
Stated interest rate (percent) | 2.05% |
Senior Notes | 1.10% Senior Notes due February 2031 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,000 | 1,000
Effective interest rate (percent) | 1.20% |
Stated interest rate (percent) | 1.10% |
Senior Notes | 4.15% Senior Notes due December 2035 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,500 | 1,500
Effective interest rate (percent) | 4.23% |
Stated interest rate (percent) | 4.15% |
Senior Notes | 2.70% Senior Notes due April 2040 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,000 | 1,000
Effective interest rate (percent) | 2.80% |
Stated interest rate (percent) | 2.70% |
Senior Notes | 4.30% Senior Notes due December 2045 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 3,500 | 3,500
Effective interest rate (percent) | 4.37% |
Stated interest rate (percent) | 4.30% |
Senior Notes | 3.65% Senior Notes due September 2047 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 750 | 750
Effective interest rate (percent) | 3.73% |
Stated interest rate (percent) | 3.65% |
Senior Notes | 2.00% Senior Notes due August 2050 | U.S. |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,750 | 1,750
Effective interest rate (percent) | 2.09% |
Stated interest rate (percent) | 2.00% |
Senior Notes | 1.50% Senior Notes due June 2026 | Europe |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,459 | 1,434
Effective interest rate (percent) | 1.71% |
Stated interest rate (percent) | 1.50% |
Senior Notes | 2.00% Senior Notes due June 2029 | Europe |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,081 | 1,062
Effective interest rate (percent) | 2.13% |
Stated interest rate (percent) | 2.00% |
Senior Notes | 2.375% Senior Notes due June 2034 | Europe |  |
Debt Instrument [Line Items] |  |
Total debt | $ 702 | $ 690
Effective interest rate (percent) | 2.53% |
Stated interest rate (percent) | 2.375% |

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