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v3.20.1

Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 03, 2019 USD ($) | Feb. 01, 2020 USD ($) segment | Feb. 02, 2019 USD ($) | Feb. 03, 2018 USD ($) | Oct. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of Operating Segments | segment |  | 2 |  |  |
Operating leases |  | $ 2,709,000,000 |  |  |
Operating lease liability |  | 2,798,000,000 |  |  |
Cash Equivalents, at Carrying Value |  | $ 1,668,000,000 | $ 1,410,000,000 |  |
Weighted Average Interest Rate on Cash Equivalents |  | 1.80% | 2.50% |  |
Allowances for uncollectible receivables |  | $ 24,000,000 | $ 23,000,000 |  |
Goodwill |  | $ 984,000,000 | $ 915,000,000 |  | $ 490,000,000
Percentage of Commissions on Sale of Extended Warranties to Revenue |  | 2.00% | 2.00% | 2.00% |
Gift card redemption within 1 year, percentage |  | 90.00% |  |  |
Revenue recognized that was included in the contract liability balance as of February 4, 2018 |  | $ 890,000,000 | $ 871,000,000 |  |
Period of Expiration for Customer Loyalty Certificates, Low End of Range |  | 2 months |  |  |
Period of Expiration for Customer Loyalty Certificates, High End of Range |  | 6 months |  |  |
Advertising expense |  | $ 840,000,000 | $ 777,000,000 | $ 776,000,000 |
Branded cards |  | 25.00% | 25.00% | 25.00% |
2021 Notes [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Debt |  | $ 650,000,000 |  |  |
2028 Notes [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Debt |  | 500,000,000 |  |  |
Best Buy Health [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Goodwill |  | 541,000,000 |  |  |
Best Buy Domestic [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Goodwill |  | 443,000,000 |  |  |
Best Buy Gift Cards [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue recognized that was included in the contract liability balance as of February 4, 2018 |  | $ 35,000,000 | $ 34,000,000 | $ 40,000,000 |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating leases | $ 2,700,000,000 |  | $ 2,732,000,000 |  |
Operating lease liability | 2,800,000,000 |  |  |  |
retained earnings | (22,000,000) |  |  |  |
retained earnings, net of tax | $ 3,000,000 |  |  |  |
Minimum [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Term of contract |  | 1 month |  |  |
Customer loyalty program, certificate expiration period |  | 1 month |  |  |
Minimum [Member] | Software [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Estimated useful lives |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Term of contract |  | 3 years |  |  |
Customer loyalty program, certificate expiration period |  | 5 years |  |  |
Maximum [Member] | Software [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Estimated useful lives |  | 7 years |  |  |

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