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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Selected quarterly financial data (unaudited)
(Millions of dollars)
 
 
 
 
 
 
2017
 
First quarter
 
Second quarter
 
Third quarter
 
Fourth quarter
Total revenues
 
$
662

 
$
676

 
$
673

 
$
678

Profit before income taxes
 
$
167

 
$
164

 
$
126

 
$
133

Profit
 
$
115

 
$
114

 
$
86

 
$
271

 
 
 
 
 
 
 
 
 
2016
 
First quarter
 
Second quarter
 
Third quarter
 
Fourth quarter
Total revenues
 
$
643

 
$
659

 
$
651

 
$
642

Profit before income taxes
 
$
145

 
$
148

 
$
146

 
$
122

Profit
 
$
100

 
$
102

 
$
97

 
$
85