v3.23.1

Members' Capital (Distributions to Other Members) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Distributions declared	$ 204	$ 2,126
Weighted average number of Units outstanding	6,542,557	6,542,557
Other Members [Member]
Distributions declared	$ 2,519	$ 2,126
Weighted average number of Units outstanding	6,542,557	6,542,557
Weighted average distributions per Unit	$ 0.39	$ 0.33

Weighted average number of limited liability company units outstanding determined by relating the portion of time within a reporting period that limited liability company units have been outstanding to the total time in that period.

+ References

No definition available.

+ Details

Name:	cik0001519117_WeightedAverageLimitedLiabilityCompanyUnits
Namespace Prefix:	cik0001519117_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of equity impact of cash distributions declared to unit-holder of limited liability company (LLC).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=125520817&loc=d3e70191-108054

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per unit of ownership amount of cash distributions paid to unit-holder of a limited liability company (LLC).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

Name:	us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	cik0001519117_MembershipCapitalByTypeAxis=cik0001519117_OtherMembersCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ATEL 15, LLC 10-Q