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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS
The table below sets forth the computation of basic and diluted EPS:
 
Year ended December 31
 
 
2018

 
 
2017

 
2016

Basic EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Basic1
$
14,824

 
 
$
9,195

 
$
(497
)
Weighted-average number of common shares outstanding2
1,897

 
 
1,882

 
1,872

     Add: Deferred awards held as stock units
1

 
 
1

 
1

Total weighted-average number of common shares outstanding
1,898

 
 
1,883

 
1,873

Earnings per share of common stock - Basic
$
7.81

 
 
$
4.88

 
$
(0.27
)
Diluted EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Diluted1
$
14,824

 
 
$
9,195

 
$
(497
)
Weighted-average number of common shares outstanding2
1,897

 
 
1,882

 
1,872

     Add: Deferred awards held as stock units
1

 
 
1

 
1

     Add: Dilutive effect of employee stock-based awards
16

 
 
15

 
—

Total weighted-average number of common shares outstanding
1,914

 
 
1,898

 
1,873

Earnings per share of common stock - Diluted
$
7.74

 
 
$
4.85

 
$
(0.27
)
 
1 There was no effect of dividend equivalents paid on stock units or dilutive impact of employee stock-based awards on earnings.
2 Millions of shares; 10 million shares of employee-based awards were not included in the 2016 diluted EPS calculation as the result would be anti-dilutive.