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Investment in Affiliates (Tables)
 6 Months Ended
Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]  
Summary of unaudited financial information related to the operating results
Summarized unaudited financial information for the affiliate is presented below for the three and six months ended June 30, 2017 and 2016:
 
 
Three months ended 
 June 30,
 
Six months ended 
 June 30,
(in millions)
 
2017
 
2016
 
2017
 
2016
Net operating revenues
 
$
214

 
$
232

 
$
422

 
$
451

Operating expenses
 
103

 
94

 
201

 
190

Operating income
 
$
111

 
$
138

 
$
221

 
$
261

Net income
 
$
111

 
$
138

 
$
221

 
$
261

FDC equity earnings
 
38

 
46

 
76

 
89