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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The following table summarizes the components of stock-based compensation:
 
2014
 
2013
 
2012
 
(In millions)
Stock-based compensation expense
$
103

 
$
99

 
$
83

Tax benefit
40

 
38

 
33

Stock-based compensation cost capitalized in property, plant and equipment
16

 
15

 
5

Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes our stock option activity for the year ended December 31, 2014:
 
Number of Options
 
Weighted Average Exercise Price
 
Aggregate Intrinsic
Value
(In millions)
Options outstanding at December 31, 2013
723,697

 
$
42.60

 
 
Granted

 
$

 
 
Exercised
(268,689
)
 
$
41.14

 
 
Forfeited or expired
(10,730
)
 
$
39.41

 
 
Options outstanding and exercisable at December 31, 2014
444,278

 
$
43.56

 
$
17

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range
The number, weighted average exercise price and weighted average remaining contractual life of options outstanding were as follows:
Range of Exercise Prices
 
Number of Options
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life (Years)
$
27.00
 —
 
$
38.00

 
25,857

 
$
27.70

 
4.16
$
38.01
 —
 
$
42.00

 
82,834

 
$
41.77

 
3.16
$
42.01
 —
 
$
45.00

 
221,487

 
$
43.93

 
4.06
$
45.01
 —
 
$
50.00

 
114,100

 
$
47.75

 
2.15
 
 
 
 
444,278

 
$
43.56

 
3.41
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
Stock award activity for the years ended December 31 was:
 
2014
 
2013
 
2012
Fair value of awards vested (in millions)
$
11

 
$
8

 
$
9

Restricted common shares awarded
159,590

 
127,785

 
167,320

Weighted average market price of shares awarded
$
70.09

 
$
64.72

 
$
53.71

Compensation cost charged against income (in millions)
$
10

 
$
23

 
$
12

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes the Company’s restricted stock awards activity for the year ended December 31, 2014:
 
Restricted
Stock
 
Weighted Average
Grant Date
Fair Value
Balance at December 31, 2013
492,329

 
$
53.76

Grants
159,590

 
$
70.09

Forfeitures
(16,841
)
 
$
62.41

Vested and issued
(218,760
)
 
$
47.77

Balance at December 31, 2014
416,318

 
$
62.82

Share Based Compensation Expense [Table Text Block]
The Company recorded compensation expense for performance share awards as follows:
 
2014
 
2013
 
2012
 
(In millions)
Compensation expense
$
93

 
$
77

 
$
71

Cash settlements (a)
$
11

 
$
9

 
$
4

Stock settlements (a)
$
61

 
$
56

 
$
41


_______________________________________
(a)
Sum of cash and stock settlements approximates the intrinsic value of the liability.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The following table summarizes the Company’s performance share activity for the period ended December 31, 2014:
 
 Performance Shares
 
Weighted Average
Grant Date
Fair Value
Balance at December 31, 2013
1,608,789

 
$

Grants
561,335

 
$
69.32

Forfeitures
(44,250
)
 
$
69.16

Payouts
(571,177
)
 
$

Balance at December 31, 2014
1,554,697

 
$
69.32

Schedule of Unrecognized Compensation Cost, Nonvested Awards
As of December 31, 2014, the total unrecognized compensation cost related to non-vested stock incentive plan arrangements and the weighted average recognition period was as follows:
 
Unrecognized
Compensation
Cost
 
Weighted Average
to be Recognized
 
(In millions)
 
(In years)
Stock awards
$
10

 
1.06
Performance shares
48

 
0.98
 
$
58

 
0.99