Long-Term Debt - Summary (Details) - USD ($)	3 Months Ended
Apr. 30, 2021	Mar. 31, 2021
Unsecured Notes Issued In 2021
Long-Term Debt
Debt instrument, redemption price, percentage	101.00%
Unsecured Notes, 2.625%
Long-Term Debt
Principal Amount		$ 1,500,000,000
Interest Rate		2.625%
Discount		$ 7,000,000
Unsecured Notes, 3.500%
Long-Term Debt
Principal Amount		$ 500,000,000
Interest Rate		3.50%
Discount		$ 5,000,000
Unsecured Notes \| Unsecured Notes Issued In 2021
Long-Term Debt
Principal Amount		$ 2,000,000,000.0

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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Balance Type:	debit
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- References

No definition available.

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