FAIR VALUE MEASUREMENTS AND INVESTMENTS - Investments (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020
Equity and other securities
Carrying Value	$ 983	$ 852
Long-Term Investments
Equity and other securities
Cost	909	783
Unrealized Gain	89	116
Unrealized (Loss)	(14)	(35)
Carrying Value	984	864
Fixed income debt securities
Fixed income debt securities
Cost	85	0
Unrealized Gain	4	0
Unrealized (Loss)	0	0
Carrying Value	$ 89	$ 0

Equity Securities Without Readily Determinable Fair Value, At Cost

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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Amount of investment in equity security without readily determinable fair value.

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Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

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