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Partnerships and Joint Ventures - Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Unconsolidated variable interest entities    
Variable interest entity information    
Net carrying value of the unconsolidated VIEs $ 216 $ 9
Unconsolidated variable interest entities | Future funding commitment    
Variable interest entity information    
Commitment amount 39  
Consolidated variable interest entities    
Variable interest entity information    
Carrying value of assets 1,200 959
Carrying value of liabilities $ 700 $ 566