Debt - Schedule of Debt Covenants (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Line Of Credit Facility Covenant [Member]
Line of Credit Facility [Line Items]
Maximum Leverage Ratio (as a percent)	0.60
Minimum fixed charge coverage ratio	1.50
Minimum tangible net worth	$ 1,910
Secured recourse indebtedness ratio	45.00%
Line Of Credit Facility Covenant Actual Results [Member]
Line of Credit Facility [Line Items]
Maximum Leverage Ratio (as a percent)	0.329
Minimum fixed charge coverage ratio	3.5
Minimum tangible net worth	$ 2,520
Secured recourse indebtedness ratio	32.10%