Net Investment in Finance Leases Narrative (Details)	Dec. 31, 2019 Aircraft
Capital Leased Assets [Line Items]
Capital Leased Assets, Number of Units	29

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.

No definition available.

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