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FAIR VALUE MEASUREMENTS AND INVESTMENTS - Additional Information (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 31, 2020
Jan. 31, 2020
Fair Value Disclosures [Abstract]    
Deferred compensation plan assets $ 264 $ 241
Deferred compensation liability 264 241
Carrying Value 983 $ 852
Equity securities, upward price adjustment 89  
Equity securities, downward price adjustment $ 11