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Variable Interest Entities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net $ 3 $ 4
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 1.00%  
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest 99.00%  
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 100.00%  
Estimated Remaining Useful Life of Facility Acquired 75.00%