Commitments and Contingencies (Details) - Commitments $ in Billions	Sep. 30, 2015 USD ($) loan
Operating leases
Number of loans with future funding commitments \| loan	55
Value of loans with future funding commitments	$ 1.7
Value of loans with future funding commitments expected to fund	$ 1.5

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