FINANCIAL SERVICES - Credit Quality Indicators (Details) - USD ($) $ in Millions	May 01, 2020	Jan. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	$ 9,232
Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,563
2020	3,968
2019	2,082
2018	694
2017	131
Years Prior	8
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	598
Customer receivables, gross		621
Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	188
Customer receivables, gross		203
Higher
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	5,378
Higher | Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	1,150
2020	2,438
2019	1,141
2018	393
2017	68
Years Prior	2
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	135
Customer receivables, gross		137
Higher | Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	51
Customer receivables, gross		55
Mid
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	2,053
Mid | Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	229
2020	883
2019	498
2018	182
2017	34
Years Prior	2
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	169
Customer receivables, gross		175
Mid | Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	56
Customer receivables, gross		63
Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Customer receivables, gross	1,801
Lower | Fixed-term | Fixed-term — Consumer and Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2021	184
2020	647
2019	443
2018	119
2017	29
Years Prior	4
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	294
Customer receivables, gross		309
Lower | Revolving | Revolving — DBC
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, revolving	$ 81
Customer receivables, gross		$ 85