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Earnings (Loss) Per Common Share
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings (Loss) Per Common Share Earnings (Loss) Per Common Share
The following table sets forth the computation of basic and diluted earnings (loss) per common share (EPS) (in millions, except share and per share amounts):
 
Three Months Ended March 31,
 
2020
 
2019
Basic EPS:
 
 
 
Net income (loss)
$
(2,241
)
 
$
185

Weighted average common shares outstanding (in thousands)
425,713

 
451,951

Basic EPS
$
(5.26
)
 
$
0.41

 
 
 
 
Diluted EPS:
 
 
 
Net income (loss) for purposes of computing diluted EPS
$
(2,241
)
 
$
185

Share computation for diluted EPS (in thousands):
 
 
 
Basic weighted average common shares outstanding
425,713

 
451,951

Dilutive effect of stock awards
—

 
1,478

Diluted weighted average common shares outstanding
425,713

 
453,429

Diluted EPS
$
(5.26
)
 
$
0.41

 
 
 
 
Restricted stock unit awards excluded from the calculation of
      diluted EPS because inclusion would be antidilutive (in
      thousands)
4,934

 
2,267