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v3.23.1

Short-term Borrowings and Long-term Debt (Debt Issued) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022
Debt Instrument [Line Items] |  |
Net Proceeds | $ 4,967 | $ 0
Senior Unsecured Notes |  |
Debt Instrument [Line Items] |  |
Net Proceeds | 4,967 |
Senior Unsecured Notes | 4.000% Debt, Due 2026 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 750 |
Fixed Interest Rate | 4.00% |
Net Proceeds | $ 748 |
Senior Unsecured Notes | 3.900% Debt, Due 2028 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 750 |
Fixed Interest Rate | 3.90% |
Net Proceeds | $ 746 |
Senior Unsecured Notes | 4.000% Debt, Due 2030 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 500 |
Fixed Interest Rate | 4.00% |
Net Proceeds | $ 497 |
Senior Unsecured Notes | 4.100% Debt, Due 2033 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 1,500 |
Fixed Interest Rate | 4.10% |
Net Proceeds | $ 1,491 |
Senior Unsecured Notes | 4.500% Debt, Due 2053 |  |
Debt Instrument [Line Items] |  |
Principal Amount | $ 1,500 |
Fixed Interest Rate | 4.50% |
Net Proceeds | $ 1,485 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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