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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Computation of basic and diluted EPS
 
Year ended December 31
 
 
2016

 
 
2015

 
2014

Basic EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Basic1
$
(497
)
 
 
$
4,587

 
$
19,241

Weighted-average number of common shares outstanding2
1,872

 
 
1,867

 
1,883

     Add: Deferred awards held as stock units
1

 
 
1

 
1

Total weighted-average number of common shares outstanding
1,873

 
 
1,868

 
1,884

Earnings per share of common stock - Basic
$
(0.27
)
 
 
$
2.46

 
$
10.21

Diluted EPS Calculation
 
 
 
 
 
 
Earnings available to common stockholders - Diluted1
$
(497
)
 
 
$
4,587

 
$
19,241

Weighted-average number of common shares outstanding2
1,872

 
 
1,867

 
1,883

     Add: Deferred awards held as stock units
1

 
 
1

 
1

     Add: Dilutive effect of employee stock-based awards
—

 
 
7

 
14

Total weighted-average number of common shares outstanding
1,873

 
 
1,875

 
1,898

Earnings per share of common stock - Diluted
$
(0.27
)
 
 
$
2.45

 
$
10.14

 
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.