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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS
 
Year ended December 31
 
 
2015

 
 
2014

 
2013

Basic EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Basic*
$
4,587

 
 
$
19,241

 
$
21,423

Weighted-average number of common shares outstanding
1,867

 
 
1,883

 
1,916

     Add: Deferred awards held as stock units
1

 
 
1

 
1

Total weighted-average number of common shares outstanding
1,868

 
 
1,884

 
1,917

Earnings per share of common stock - Basic
$
2.46

 
 
$
10.21

 
$
11.18

Diluted EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Diluted*
$
4,587

 
 
$
19,241

 
$
21,423

Weighted-average number of common shares outstanding
1,867

 
 
1,883

 
1,916

     Add: Deferred awards held as stock units
1

 
 
1

 
1

     Add: Dilutive effect of employee stock-based awards
7

 
 
14

 
15

Total weighted-average number of common shares outstanding
1,875

 
 
1,898

 
1,932

Earnings per share of common stock - Diluted
$
2.45

 
 
$
10.14

 
$
11.09

* There was no effect of dividend equivalents paid on stock units or dilutive impact of employee stock-based awards on earnings.