FINANCIAL SERVICES - Credit Quality Indicators (Details) - USD ($) $ in Millions	Oct. 30, 2020	Jan. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	$ 10,081
Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	4,214
2020	3,269
2019	1,434
2018	336
2017	59
Years Prior	1
Customer receivables, gross		$ 8,486
Revolving
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross		9,310
Revolving | Revolving — DPA
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	592
Customer receivables, gross		621
Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	176
Customer receivables, gross		203
Higher
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	5,761
Higher | Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	2,591
2020	1,961
2019	780
2018	191
2017	32
Years Prior	0
Customer receivables, gross		5,042
Higher | Revolving
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross		5,234
Higher | Revolving | Revolving — DPA
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	158
Customer receivables, gross		137
Higher | Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	48
Customer receivables, gross		55
Mid
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	2,321
Mid | Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	900
2020	736
2019	351
2018	92
2017	13
Years Prior	0
Customer receivables, gross		2,036
Mid | Revolving
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross		2,274
Mid | Revolving | Revolving — DPA
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	177
Customer receivables, gross		175
Mid | Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	52
Customer receivables, gross		63
Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	1,999
Lower | Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	723
2020	572
2019	303
2018	53
2017	14
Years Prior	1
Customer receivables, gross		1,408
Lower | Revolving
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross		1,802
Lower | Revolving | Revolving — DPA
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	257
Customer receivables, gross		309
Lower | Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	$ 76
Customer receivables, gross		$ 85