Legal Matters (Details) - May. 31, 2015 $ in Millions	USD ($) a member plaintiff
Nevada Development Contract Litigation
Loss Contingencies [Line Items]
Acres of purchased land by LVDA | a	83
Expected compensatory damages	$ 55
Expected interest charges	$ 41
Edwards, K. [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | plaintiff	409
Edwards, K. and Andrea L. Bejenaru, et. al. [Member] [Member]
Loss Contingencies [Line Items]
Expected compensatory damages	$ 66
Loss Contingency, Number of Plaintiffs | plaintiff	11
Andrea L. Bejenaru, et. al. [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | member	241