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TRANSACTIONS WITH MAJOR CUSTOMERS (Tables)
 12 Months Ended
Dec. 31, 2017
TRANSACTIONS WITH MAJOR CUSTOMERS  
Schedule of revenues from major customers

                                                                                                                                                                                    


Year Ended December 31 (millions of dollars)

 
2017

 
2016

 
2015

 

Anadarko Energy Services Company (Anadarko)

 
48

 
48

 
48

 

Pacific Gas and Electric Company (Pacific Gas)

 
33

(a)(b)
36

(a)
42

 

 

 

 

(a)          

Less than 10 percent of trade accounts receivable

(b)          

Less than 10 percent of consolidated revenue