Commitments (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Commitments [Abstract]
Commitments to purchase lease assets	$ 0

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration