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Stock-Based Compensation (tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Awards [Table Text Block]
Dollars in millions
 
Shares(1)
 
Expense During Award Year(3)
 
Total Expense for Award
Estimated award:
 
 
 
 
 
 
2012-2014 grant(2)
 
8,408

 
$
0.6

 
$
1.8

Actual award:
 
 
 
 
 
 
2011-2013 grant
 
9,819

 
0.4

 
1.0

2010-2012 grant
 
9,924

 
0.5

 
1.2
Schedule Of Performance Based Award [Table Text Block]
Dollars in thousands
 
Performance Share Awards Outstanding
 
2014
 
Cumulative Expense
Performance Period
 
Target
 
Maximum
 
Expense
 
December 31, 2014
2012-14
 
35,340

 
70,680

 
$
583

 
$
1,821

2013-15
 
37,300

 
74,600

 
442

 
928

2014-16
 
43,625

 
87,250

 
618

 
618

Total
 
116,265

 
232,530

 
$
1,643

 
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
 
 
Number of RSUs
 
Weighted -
Average
Price Per RSU
Nonvested, December 31, 2011
 
—

 
$
—

Granted
 
25,224

 
47.58

Vested
 
—

 
—

Forfeited
 
(360
)
 
48.00

Nonvested, December 31, 2012
 
24,864

 
$
47.57

Granted
 
25,748

 
45.38

Vested
 
(5,455
)
 
48.01

Forfeited
 
(590
)
 
46.58

Nonvested, December 31, 2013
 
44,567

 
46.27

Granted
 
38,765

 
42.19

Vested
 
(12,060
)
 
46.52

Forfeited
 
(478
)
 
45.47

Nonvested, December 31, 2014
 
70,794

 
44.00
SOP Assumptions [Table Text Block]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Option
Shares
 
Weighted -
Average
Price Per Share
 
Intrinsic
Value
(In millions)
Balance outstanding, December 31, 2011
 
579,225

 
$
42.09

 
$
3.4

Exercised
 
(46,825
)
 
40.62

 
0.4

Forfeited
 
(2,475
)
 
43.78

 
n/a

Balance outstanding, December 31, 2012
 
529,925

 
42.22

 
1.3

Exercised
 
(33,800
)
 
32.16

 
0.3

Forfeited
 
(3,975
)
 
43.72

 
n/a

Balance outstanding, December 31, 2013
 
492,150

 
42.89

 
0.6

Exercised
 
(69,662
)
 
39.82

 
0.5

Forfeited
 
(6,400
)
 
43.59

 
n/a

Balance outstanding, December 31, 2014
 
416,088

 
43.40

 
2.7

Exercisable,
December 31, 2014
 
388,965

 
43.23

 
2.6
Schedule Of Stock Based Compensation Capitalized Under LTIP SOP and ESPP [Table Text Block]
In thousands
2014
2013
2012
Operations and maintenance expense, for stock-based compensation
$
2,309

$
1,876

$
1,668

Income tax benefit
(861
)
(765
)
(707
)
Net stock-based compensation effect on net income
$
1,448

$
1,111

$
961

Amounts capitalized for stock-based compensation
$
597

$
331

$
294