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Quarterly Results (unaudited)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results (unaudited)
Note 21
Quarterly Results (unaudited)
 
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
($ in millions, except per share data)

 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Revenues
 
$
9,770

 
$
9,644

 
$
10,099

 
$
9,813

 
$
10,465

 
$
9,888

 
$
9,481

 
$
10,062

Net income (loss) applicable to common shareholders
 
946

 
666

 
637

 
550

 
833

 
637

 
(312
)
 
1,220

Earnings per common share - Basic
 
2.67

 
1.82

 
1.82

 
1.51

 
2.41

 
1.76

 
(0.91
)
 
3.41

Earnings per common share - Diluted
 
2.63

 
1.79

 
1.80

 
1.49

 
2.37

 
1.74

 
(0.91
)
 
3.35