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Income per Common Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The per share calculations below exclude $6 million, $6 million and 11 million stock options in 2019, 2018 and 2017 that were antidilutive.
 
Year Ended December 31,
(In millions, except per share data)
2019
 
2018
 
2017
Income (loss) from continuing operations
$
480

 
$
1,096

 
$
(830
)
Loss from discontinued operations
—

 
—

 
(4,893
)
Net income (loss)
$
480

 
$
1,096

 
$
(5,723
)
 
 
 
 
 
 
Weighted average common shares outstanding
810

 
846

 
850

Effect of dilutive securities
—

 
1

 
—

Weighted average common shares, diluted
810

 
847

 
850

Per basic share:
 

 
 

 
 
Income (loss) from continuing operations
$
0.59

 
$
1.30

 
$
(0.97
)
Loss from discontinued operations
$
—

 
$
—

 
$
(5.76
)
Net income (loss)
$
0.59

 
$
1.30

 
$
(6.73
)
Per diluted share:
 
 
 
 
 
Income (loss) from continuing operations
$
0.59

 
$
1.29

 
$
(0.97
)
Loss from discontinued operations
$
—

 
$
—

 
$
(5.76
)
Net income (loss)
$
0.59

 
$
1.29

 
$
(6.73
)
Dividends per share
$
0.20

 
$
0.20

 
$
0.20