Investment- Equity Method and Joint Ventures Equity Method Investments and Joint Ventures, Narrative (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Jun. 01, 2013	Dec. 02, 2014
Schedule of Equity Method Investments
Investment in joint venture	$ 0	$ 0
Watson Cogeneration Company
Schedule of Equity Method Investments
Joint venture, Ownership Percentage			51.00%
Vancouver Energy
Schedule of Equity Method Investments
Throughput Capacity	360,000
TRG
Schedule of Equity Method Investments
Joint venture, Ownership Percentage				50.00%
UBFS
Schedule of Equity Method Investments
Joint venture, Ownership Percentage				38.00%
Minimum | Vancouver Energy
Schedule of Equity Method Investments
Investment in joint venture	95
Maximum | Vancouver Energy
Schedule of Equity Method Investments
Investment in joint venture	$ 105