FINANCIAL SERVICES - Aging Customer Financing Receivables, Gross, Including Accrued Interest (Details) - USD ($) $ in Millions	May 01, 2020	Jan. 31, 2020
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross	$ 9,232
Customer receivables
Financing Receivable, Past Due [Line Items]
Current	7,672	$ 8,739
Total customer receivables, gross	9,232	9,310
Revolving
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross		9,310
Revolving | Customer receivables
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross	786	824
Revolving | Revolving — DPA
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross		621
Revolving | Revolving — DPA | Customer receivables
Financing Receivable, Past Due [Line Items]
Current	547	550
Total customer receivables, gross	598	621
Revolving | Revolving — DBC
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross		203
Revolving | Revolving — DBC | Customer receivables
Financing Receivable, Past Due [Line Items]
Current	162	184
Total customer receivables, gross	188	203
Fixed-term | Customer receivables
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross	8,446	8,486
Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Past Due [Line Items]
Total customer receivables, gross		8,486
Fixed-term | Fixed-term — Consumer and Commercial | Customer receivables
Financing Receivable, Past Due [Line Items]
Current	6,963	8,005
Total customer receivables, gross	8,446	8,486
Past Due 1 — 90 Days | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	1,388	439
Past Due 1 — 90 Days | Revolving | Revolving — DPA | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	34	51
Past Due 1 — 90 Days | Revolving | Revolving — DBC | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	21	15
Past Due 1 — 90 Days | Fixed-term | Fixed-term — Consumer and Commercial | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	1,333	373
Past Due 90 Days | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	172	132
Past Due 90 Days | Revolving | Revolving — DPA | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	17	20
Past Due 90 Days | Revolving | Revolving — DBC | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	5	4
Past Due 90 Days | Fixed-term | Fixed-term — Consumer and Commercial | Customer receivables
Financing Receivable, Past Due [Line Items]
Past due	$ 150	$ 108