FINANCIAL SERVICES - DFS Debt (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	$ 53,953	$ 52,056
Short-term debt	10,345	7,737
Long-term debt	43,608	44,319
Secured Debt \| U.S. \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	5,911	5,340
Secured Debt \| International \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	2,926	2,425
Asset-based financing and securitization facilities \| Secured Debt \| U.S. \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	2,936	2,606
Asset-based financing and securitization facilities \| Secured Debt \| International \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	835	743
Fixed-term securitization offerings \| Secured Debt \| U.S. \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	2,788	2,593
Other \| Secured Debt \| U.S. \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	187	141
Other \| Secured Debt \| International \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	719	931
Note payable \| Secured Debt \| International \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	187	200
Dell Bank Senior Unsecured Eurobonds \| Unsecured Debt \| International \| Finance Leases and Revolving Loan Portfolio Segments
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value	1,185	551
DFS Debt \| Secured Debt
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Total debt, carrying value		7,765
Short-term debt	4,188	4,152
Long-term debt	$ 4,649	$ 3,613

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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