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Other Assets (Tables)
12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Variable Interest Entities
The following table provides information related to this Partnership (in millions):
 
Year Ended
 
Year Ended
 
December 31, 2018
 
December 31, 2017
Unamortized investment balance classified as other assets
$
51

 
$
118

Maximum exposure to loss
$
51

 
$
118