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Quarterly Results (unaudited)
 12 Months Ended
Dec. 31, 2019
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)

 
2019

2018

2019

2018

2019

2018

2019

2018
Revenues
 
$
10,990

 
$
9,770

 
$
11,144

 
$
10,099

 
$
11,069

 
$
10,465

 
$
11,472

 
$
9,481

Net income (loss) applicable to common shareholders
 
1,261

 
977

 
821

 
678

 
889

 
942

 
1,707

 
(585
)
Earnings per common share - Basic
 
3.79

 
2.76

 
2.47

 
1.94

 
2.71

 
2.72

 
5.32

 
(1.71
)
Earnings per common share - Diluted
 
3.74

 
2.71

 
2.44

 
1.91

 
2.67

 
2.68

 
5.23

 
(1.71
)

The Company changed its accounting principle for recognizing actuarial gains and losses and expected return on plan assets for its pension and other postretirement plans to a more preferable policy under U.S. GAAP. See Note 2 for discussion of the change in accounting principle and further information regarding the impact of the change on the consolidated financial statements.
Impact of change
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
($ in millions, except per share data)
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Revenues
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Net income (loss) applicable to common shareholders
 
5

 
31

 
(69
)
 
41

 
(140
)
 
109

 
240

 
(273
)
Earnings per common share - Basic
 
0.01

 
0.09

 
(0.21
)
 
0.12

 
(0.43
)
 
0.31

 
0.75

 
(0.80
)
Earnings per common share - Diluted
 
0.02

 
0.08

 
(0.20
)
 
0.11

 
(0.42
)
 
0.31

 
0.73

 
(0.80
)