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Quarterly Results (unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results (unaudited)
Quarterly Results (unaudited)
($ in millions)
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Revenues
$
751

 
$
685

 
$
816

 
$
742

 
$
804

 
$
713

 
$
848

 
$
751

Net income (1)
86

 
52

 
120

 
94

 
140

 
65

 
650

 
108

___________
(1) 
Net income includes a tax benefit of $514 million related to the fourth quarter 2017 Tax Legislation.