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Quarterly Results (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly results
($ in millions)
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Revenues
$
736

 
$
762

 
$
783

 
$
826

 
$
787

 
$
813

 
$
541

 
$
858

Net income (1)
90

 
86

 
134

 
120

 
193

 
140

 
(52
)
 
650

___________
(1) 
Net income includes a tax benefit of $53 million and $514 million related to Tax Legislation in the third quarter 2018 and fourth quarter 2017, respectively.