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Leases - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 location vehicle
Real Estate Leases
Lessee, Lease, Description
Number of locations | location	87
Number of lease not yet commenced having initial lease term of twelve months or longer | vehicle	0
Real Estate Leases | Minimum
Lessee, Lease, Description
Lessee, operating lease, term of contract (in years)	1 month
Lessee, operating lease, option to extend term (in years)	1 year
Real Estate Leases | Maximum
Lessee, Lease, Description
Lessee, operating lease, term of contract (in years)	9 years
Lessee, operating lease, option to extend term (in years)	10 years
Flexdrive Program | Minimum
Lessee, Lease, Description
Finance lease term of contract (in years)	1 month
Flexdrive Program | Maximum
Lessee, Lease, Description
Finance lease term of contract (in years)	4 years

X

- Definition

Lessee, Finance Lease, Remaining Term

+ References

No definition available.

+ Details

Name:	lyft_LesseeFinanceLeaseRemainingTerm
Namespace Prefix:	lyft_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee operating lease options to extend term.

+ References

No definition available.

+ Details

Name:	lyft_LesseeOperatingLeaseOptionsToExtendTerm
Namespace Prefix:	lyft_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of lease not yet commenced having initial lease term of twelve months or longer.

+ References

No definition available.

+ Details

Name:	lyft_NumberOfLeaseNotYetCommencedHavingInitialLeaseTermOfTwelveMonthsOrLonger
Namespace Prefix:	lyft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of locations.

+ References

No definition available.

+ Details

Name:	lyft_NumberOfLocations
Namespace Prefix:	lyft_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Remaining lessee operating lease term of contract.

+ References

No definition available.

+ Details

Name:	lyft_RemainingLesseeOperatingLeaseTermOfContract
Namespace Prefix:	lyft_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=lyft_RealEstateLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=lyft_FlexdriveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: