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FAIR VALUE MEASUREMENTS - Contractual Maturities of Debt Securities (Details) $ in Millions	Jan. 31, 2021 USD ($)
Contractual Maturities of Debt Securities, Amortized Cost
Amortized cost, due in one year or less	$ 21
Amortized cost, due after one through five years	89
Amortized cost, due after five through 10 years	117
Amortized cost, due after 10 years	203
Amortized cost, mortgage-backed securities	134
Amortized cost, debt securities	564
Contractual Maturities of Debt Securities, Fair Value
Fair value, due in one year or less	22
Fair value, due after one through five years	94
Fair value, due after five through 10 years	124
Fair value, due after 10 years	215
Fair value, mortgage-backed securities	140
Fair value, debt securities	$ 595

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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