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Revenue Recognition Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Millions	May 05, 2018 USD ($)
Revenue, Performance Obligation Satisfied over Time [Abstract]
Revenue, Remaining Performance Obligation, in next 12 Months	$ 20
Revenue, Remaining Performance Obligation, in Year 1	15
Revenue, Remaining Performance Obligation, in Year 2	6
Revenue, Remaining Performance Obligation, in Year 3	2
Revenue, Remaining Performance Obligation, in Year 4 and beyond	$ 1

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue, if performance of the contract is expected to have a duration of more than one year - in year 1.

+ References

No definition available.

+ Details

Name:	bby_RevenueRemainingPerformanceObligationinYear1
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue, if performance of the contract is expected to have a duration of more than one year - in year 2.

+ References

No definition available.

+ Details

Name:	bby_RevenueRemainingPerformanceObligationinYear2
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue, if performance of the contract is expected to have a duration of more than one year - in year 3.

+ References

No definition available.

+ Details

Name:	bby_RevenueRemainingPerformanceObligationinYear3
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue, if performance of the contract is expected to have a duration of more than one year - in year 4 and beyond.

+ References

No definition available.

+ Details

Name:	bby_RevenueRemainingPerformanceObligationinYear4andbeyond
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue, if performance of the contract is expected to have a duration of more than one year - in next 12 months.

+ References

No definition available.

+ Details

Name:	bby_RevenueRemainingPerformanceObligationinnext12Months
Namespace Prefix:	bby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenuePerformanceObligationSatisfiedOverTimeAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration