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Debt - Summary of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Unamortized discounts and debt issuance costs | $ (103) | $ (108)
Hedge accounting fair value adjustments | 243 | 87
Total carrying value of debt | 17,892 | 16,729
Current maturities of debt | 3,999 | 0
Long-term debt | 13,893 | 16,729
Senior Notes |  |
Debt Instrument [Line Items] |  |
Total debt | 17,752 | 16,750
Total carrying value of debt | 16,900 | 16,700
Senior Notes | 2.20% Senior Notes due December 2020 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 3,000 | 3,000
Effective interest rate (percent) | 2.30% |
Stated interest rate | 2.20% |
Senior Notes | 2.15% Senior Notes due September 2022 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,000 | 1,000
Effective interest rate (percent) | 2.30% |
Stated interest rate | 2.15% |
Senior Notes | 2.80% Senior Notes due December 2022 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 2,250 | 2,250
Effective interest rate (percent) | 2.89% |
Stated interest rate | 2.80% |
Senior Notes | 3.15% Senior Notes due December 2025 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 4,000 | 4,000
Effective interest rate (percent) | 3.26% |
Stated interest rate | 3.15% |
Senior Notes | 2.75% Senior Notes due September 2027 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 750 | 750
Effective interest rate (percent) | 2.91% |
Stated interest rate | 2.75% |
Senior Notes | 4.15% Senior Notes due December 2035 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 1,500 | 1,500
Effective interest rate (percent) | 4.23% |
Stated interest rate | 4.15% |
Senior Notes | 4.30% Senior Notes due December 2045 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 3,500 | 3,500
Effective interest rate (percent) | 4.37% |
Stated interest rate | 4.30% |
Senior Notes | 3.65% Senior Notes due September 2047 |  |
Debt Instrument [Line Items] |  |
Total debt | $ 750 | 750
Effective interest rate (percent) | 3.73% |
Stated interest rate | 3.65% |
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short-term Debt | $ 1,002 | $ 0
Effective interest rate (percent) | 1.55% |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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