CAPITALIZATION - Schedule of Stock by Class (Details) - shares	Jul. 31, 2020	Jan. 31, 2020
Class of Stock [Line Items]
Authorized (in shares)	9,143,000,000	9,143,000,000
Issued (in shares)	753,000,000	745,000,000
Outstanding shares (in shares)	745,000,000	743,000,000
Class A
Class of Stock [Line Items]
Authorized (in shares)	600,000,000	600,000,000
Issued (in shares)	385,000,000	385,000,000
Outstanding shares (in shares)	385,000,000	385,000,000
Class B
Class of Stock [Line Items]
Authorized (in shares)	200,000,000	200,000,000
Issued (in shares)	102,000,000	102,000,000
Outstanding shares (in shares)	102,000,000	102,000,000
Class C
Class of Stock [Line Items]
Authorized (in shares)	7,900,000,000	7,900,000,000
Issued (in shares)	266,000,000	258,000,000
Outstanding shares (in shares)	258,000,000	256,000,000
Class D
Class of Stock [Line Items]
Authorized (in shares)	100,000,000	100,000,000
Issued (in shares)	0	0
Outstanding shares (in shares)	0	0
Class V
Class of Stock [Line Items]
Authorized (in shares)	343,000,000	343,000,000
Issued (in shares)	0	0
Outstanding shares (in shares)	0	0