Real Estate (Classification of Investment Property Leases) (Details)	12 Months Ended
	Dec. 31, 2015 property
Property Subject to or Available for Operating Lease [Line Items]
Weighted average remaining lease term (years)	11 years 5 months
Operating
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased	2,294
Direct financing
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased	10
Building portion – direct financing/land portion – operating
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased	2