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Earnings (Loss) Per Common Share Level 1 (Notes)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Computation of Basic and Diluted Earnings (Loss) per Common Share
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In millions, except for per share data)
2017
2016
 
2017
2016
Earnings
 
 
 
 
 
Net income (loss)
$
(40
)
$
216

 
$
338

$
539

Shares
 
 
 
 
 
Weighted average common shares outstanding, basic
366.0

391.8

 
368.7

395.2

Dilutive effect of stock compensation plans
—

3.2

 
4.0

3.6

Dilutive effect of warrants
—

3.6

 
2.8

3.6

Weighted average common shares outstanding and dilutive potential common shares
366.0

398.6

 
375.5

402.4

Net income (loss) per common share
 
 
 
 
 
Basic
$
(0.11
)
$
0.55

 
$
0.92

$
1.36

Diluted
$
(0.11
)
$
0.54

 
$
0.90

$
1.34


As a result of the net loss for three months ended June 30, 2017, the Company was required to use basic weighted average common shares outstanding in the calculation of diluted loss per share, since the inclusion of 3.8 million shares for stock compensation plans and 2.5 million shares for warrants would have been antidilutive to the earnings (loss) per share calculation. In the absence of the net loss, weighted average common shares outstanding and dilutive potential common shares would have totaled 372.3 million.