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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected quarterly financial data (unaudited)
(Millions of dollars)
 
 
 
 
 
 
2015
 
First quarter
 
Second quarter
 
Third quarter
 
Fourth quarter
Total revenues
 
$
689

 
$
683

 
$
653

 
$
648

Profit before income taxes
 
$
187

 
$
150

 
$
153

 
$
129

Profit
 
$
133

 
$
104

 
$
109

 
$
114

 
 
 
 
 
 
 
 
 
2014
 
First quarter
 
Second quarter
 
Third quarter
 
Fourth quarter
Total revenues
 
$
711

 
$
728

 
$
743

 
$
703

Profit before income taxes
 
$
182

 
$
208

 
$
197

 
$
166

Profit
 
$
131

 
$
148

 
$
148

 
$
108