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Partnerships and Joint Ventures - Variable Interest Entities (Details 3) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Unconsolidated variable interest entities    
Variable interest entity information    
Net carrying value of the unconsolidated VIEs $ 208 $ 107
Unconsolidated variable interest entities | Future funding commitment    
Variable interest entity information    
Commitment amount 15  
Consolidated variable interest entities    
Variable interest entity information    
Carrying value of assets 863 891
Carrying value of liabilities $ 443 $ 442