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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS
 
Year ended December 31
 
 
2012

 
 
2011

 
2010

Basic EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Basic*
$
26,179

 
 
$
26,895

 
$
19,024

Weighted-average number of common shares outstanding
1,950

 
 
1,986

 
1,996

     Add: Deferred awards held as stock units
—

 
 
—

 
1

Total weighted-average number of common shares outstanding
1,950

 
 
1,986

 
1,997

Earnings per share of common stock - Basic
$
13.42

 
 
$
13.54

 
$
9.53

Diluted EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Diluted*
$
26,179

 
 
$
26,895

 
$
19,024

Weighted-average number of common shares outstanding
1,950

 
 
1,986

 
1,996

     Add: Deferred awards held as stock units
—

 
 
—

 
1

     Add: Dilutive effect of employee stock-based awards
15

 
 
15

 
10

Total weighted-average number of common shares outstanding
1,965

 
 
2,001

 
2,007

Earnings per share of common stock - Diluted
$
13.32

 
 
$
13.44

 
$
9.48

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