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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
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
 
 
2017

 
 
2016

 
2015

Basic EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Basic1
$
9,195

 
 
$
(497
)
 
$
4,587

Weighted-average number of common shares outstanding2
1,882

 
 
1,872

 
1,867

     Add: Deferred awards held as stock units
1

 
 
1

 
1

Total weighted-average number of common shares outstanding
1,883

 
 
1,873

 
1,868

Earnings per share of common stock - Basic
$
4.88

 
 
$
(0.27
)
 
$
2.46

Diluted EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Diluted1
$
9,195

 
 
$
(497
)
 
$
4,587

Weighted-average number of common shares outstanding2
1,882

 
 
1,872

 
1,867

     Add: Deferred awards held as stock units
1

 
 
1

 
1

     Add: Dilutive effect of employee stock-based awards
15

 
 
—

 
7

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

 
 
1,873

 
1,875

Earnings per share of common stock - Diluted
$
4.85

 
 
$
(0.27
)
 
$
2.45

 
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.