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Investment in Affiliates (Tables)
 6 Months Ended
Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Summary of financial information related to the operating results
Summarized financial information for the affiliates is presented below for the periods presented:
 
 
Three months ended 
 June 30,
 
Six months ended 
 June 30,
(in millions)
 
2016
 
2015
 
2016
 
2015
Net operating revenues
 
$
299

 
$
294

 
$
580

 
$
563

Operating expenses
 
127

 
128

 
256

 
249

Operating income
 
$
172

 
$
166

 
$
324

 
$
314

Net income
 
$
172

 
$
166

 
$
324

 
$
315

FDC equity earnings
 
58

 
53

 
112

 
99