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Partnerships and Joint Ventures - Variable Interest Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Unconsolidated variable interest entities    
Variable interest entity information    
Net carrying value of the unconsolidated VIEs $ 212 $ 237
Unconsolidated variable interest entities | Future funding commitment    
Variable interest entity information    
Commitment amount 77  
Consolidated variable interest entities    
Variable interest entity information    
Carrying value of assets 1,100 1,200
Carrying value of liabilities $ 785 $ 745