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Earnings Per Common Share ("EPS") (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Common Share
 
 
2018
 
2017
 
2016
Income from continuing operations
 
$
1,542

 
$
1,340

 
$
1,018

Income from discontinued operations
 
N/A

 
N/A

 
625

Net Income
 
$
1,542


$
1,340


$
1,643

Weighted-average common shares outstanding (for basic calculation)
 
322

 
347

 
394

Effect of dilutive share-based employee compensation
 
7

 
8

 
6

Weighted-average common and dilutive potential common shares outstanding (for diluted calculation)
 
329

 
355

 
400

Basic EPS from continuing operations
 
$
4.80

 
$
3.86

 
$
2.58

Basic EPS from discontinued operations
 
N/A

 
N/A

 
1.59

Basic EPS
 
$
4.80


$
3.86


$
4.17

Diluted EPS from continuing operations
 
$
4.69

 
$
3.77

 
$
2.54

Diluted EPS from discontinued operations
 
N/A

 
N/A

 
$
1.56

Diluted EPS
 
$
4.69


$
3.77


$
4.10

Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation(a)
 
2.0

 
2.3

 
5.0


(a)
These unexercised employee stock options and stock appreciation rights were not included in the computation of diluted EPS because to do so would have been antidilutive for the periods presented.