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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The Company's Consolidated Statements of Operations included the following transactions with related parties for the periods indicated (in millions):
Years Ended December 31,
2017
 
2016
 
2015
Revenue—Non-Regulated
$
1,297

 
$
1,100

 
$
1,099

Cost of Sales—Non-Regulated
220

 
210

 
330

Interest income
8

 
4

 
25

Interest expense
36

 
39

 
33
Schedule of Related Party Receivables Payables
The following table summarizes the balances receivable from and payable to related parties included in the Company's Consolidated Balance Sheets as of the periods indicated (in millions):
December 31,
2017
 
2016
Receivables from related parties
$
250

 
$
218

Accounts and notes payable to related parties
727

 
892