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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Stock-based compensation for the reporting periods is as follows:
 
2013
 
2012
 
2011
 
(In millions)
Stock-based compensation expense
$
99

 
$
83

 
$
66

Tax benefit
38

 
33

 
25

Stock-based compensation cost capitalized in property, plant and equipment
15

 
5

 
4
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock option activity was as follows:
 
Number of
Options
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic
Value (In millions)
Options outstanding at December 31, 2012
1,192,670

 
$
41.86

 
 
Granted
—

 
$
—

 
 
Exercised
(458,603
)
 
$
40.71

 
 
Forfeited or expired
(10,370
)
 
$
41.46

 
 
Options outstanding and exercisable at December 31, 2013
723,697

 
$
42.60

 
$
18
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The number, weighted average exercise price and weighted average remaining contractual life of options outstanding were as follows:
 
 
 
 
 
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life (Years)
 
 
 
 
Number of Options
 
 
Range of Exercise Prices
 
 
 
$
27.00

—
$
38.00

 
67,257

 
$
28.30

 
5.15
$
38.01

—
$
42.00

 
167,447

 
$
41.23

 
3.21
$
42.01

—
$
45.00

 
351,893

 
$
44.02

 
4.16
$
45.01

—
$
50.00

 
137,100

 
$
47.67

 
3.08
 
 
 
 
723,697

 
$
42.60

 
3.83
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
Stock award activity for the years ended December 31 was:
 
2013
 
2012
 
2011
Fair value of awards vested (in millions)
$
8

 
$
9

 
$
13

Restricted common shares awarded
127,785

 
167,320

 
381,840

Weighted average market price of shares awarded
$
64.72

 
$
53.71

 
$
47.98

Compensation cost charged against income (in millions)
$
23

 
$
12

 
$
12
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table summarizes the Company’s stock awards activity for the period ended December 31, 2013:
 
Restricted
Stock
 
Weighted Average
Grant Date
Fair Value
Balance at December 31, 2012
597,648

 
$
48.33

Grants
127,785

 
$
64.72

Forfeitures
(7,155
)
 
$
54.61

Vested and issued
(225,949
)
 
$
45.54

Balance at December 31, 2013
492,329

 
$
53.76
Share Based Compensation Expense [Table Text Block]
The Company recorded compensation expense for performance share awards as follows:
 
2013
 
2012
 
2011
 
(In millions)
Compensation expense
$
77

 
$
71

 
$
53

Cash settlements (a)
$
9

 
$
4

 
$
3

Stock settlements (a)
$
56

 
$
41

 
$
25
Summary of Performance Share Activity [Table Text Block]
The following table summarizes the Company’s performance share activity for the period ended December 31, 2013:
 
 Performance Shares
Balance at December 31, 2012
1,634,364

Grants
564,561

Forfeitures
(41,512
)
Payouts
(548,624
)
Balance at December 31, 2013
1,608,789
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
 
Unrecognized
Compensation
Cost
 
Weighted Average
to be Recognized
 
(In millions)
 
(In years)
Stock awards
$
10

 
0.93
Performance shares
45

 
0.93
 
$
55

 
0.93