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QUARTERLY DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information [Table Text Block]
The following table presents quarterly unaudited financial data for the periods presented on the consolidated statements of operations (in millions, except per share amounts):
 
 
Quarter Ended
 
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Operating revenue
 
$
404

 
$
403

 
$
424

 
$
418

 
$
429

 
$
421

 
$
495

 
$
457

Operating (loss) income
 
$
(23
)
 
$
(14
)
 
$
20

 
$
5

 
$
46

 
$
60

 
$
58

 
$
58

Net (loss) income
 
$
(52
)
 
$
(37
)
 
$
(37
)
 
$
(29
)
 
$
15

 
$
54

 
$
131

 
$
8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(Loss) earnings per share:
Basic
 
$
(0.41
)
 
$
(0.29
)
 
$
(0.28
)
 
$
(0.23
)
 
$
0.11

 
$
0.42

 
$
1.02

 
$
0.06

Diluted
 
$
(0.41
)
 
$
(0.29
)
 
$
(0.28
)
 
$
(0.23
)
 
$
0.11

 
$
0.42

 
$
1.01

 
$
0.06

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash dividend declared per share:
 
$
0.25

 
$
0.25

 
$
0.25

 
$
0.25

 
$
0.25

 
$
0.25

 
$
0.25

 
$
0.25