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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation [Table Text Block]
We recorded the following compensation related to restricted stock and stock options during the years ended December 31, 2013, 2012 and 2011:
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
 
 
($ in millions)
Natural gas and oil properties
 
$
52

 
$
71

 
$
112

General and administrative expenses
 
60

 
71

 
92

Natural gas, oil and NGL production expenses
 
21

 
24

 
33

Marketing, gathering and compression expenses
 
7

 
15

 
17

Oilfield services expenses
 
10

 
10

 
11

Total
 
$
150

 
$
191

 
$
265
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] [Table Text Block]
A summary of the changes in unvested shares of restricted stock during 2013, 2012 and 2011 is presented below.
 
 
Number of
Unvested
Restricted Shares
 
Weighted Average
Grant Date
Fair Value
 
 
(in thousands)
 
 
Unvested shares as of January 1, 2013
 
18,899

 
$
23.72

Granted
 
9,189

 
$
19.68

Vested
 
(12,897
)
 
$
21.32

Forfeited
 
(1,791
)
 
$
22.86

Unvested shares as of December 31, 2013
 
13,400

 
$
23.38

 
 
 
 
 
Unvested shares as of January 1, 2012
 
19,544

 
$
26.97

Granted
 
9,480

 
$
21.13

Vested
 
(8,620
)
 
$
28.08

Forfeited
 
(1,505
)
 
$
24.57

Unvested shares as of December 31, 2012
 
18,899

 
$
23.72

 
 
 
 
 
Unvested shares as of January 1, 2011
 
21,375

 
$
28.68

Granted
 
9,541

 
$
28.38

Vested
 
(10,401
)
 
$
31.76

Forfeited
 
(971
)
 
$
27.28

Unvested shares as of December 31, 2011
 
19,544

 
$
26.97
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The Company used the following weighted-average assumptions to estimate the fair value of the stock options granted in 2013:
Expected option life - years
 
6.49

Volatility
 
48.47
%
Risk-free interest rate
 
1.30
%
Dividend yield
 
1.82
%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table provides information related to stock option activity for 2013, 2012 and 2011: 
 
 
Number of
Shares
Underlying  
Options
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted  
Average
Contract
Life in
Years
 
Aggregate  
Intrinsic
Value(a)
 
 
(in thousands)
 
 
 
 
 
($ in millions)
Outstanding at January 1, 2013
 
481

 
$
12.69

 
0.96
 
$
2

Granted
 
5,264

 
$
19.32

 
 
 
 
Exercised
 
(346
)
 
$
10.82

 
 
 
$
11

Expired
 
(131
)
 
$
19.31

 
 
 
 
Outstanding at December 31, 2013
 
5,268

 
$
19.28

 
6.66
 
$
41

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2013
 
1,552

 
$
18.82

 
1.97
 
$
13

 
 
 
 
 
 
 
 
 
Outstanding at January 1, 2012
 
1,051

 
$
9.84

 
1.41
 
$
13

Exercised
 
(570
)
 
$
7.45

 
 
 
$
7

Outstanding and exercisable at December 31, 2012
 
481

 
$
12.69

 
0.96
 
$
2

 
 
 
 
 
 
 
 
 
Outstanding at January 1, 2011
 
1,808

 
$
8.90

 
2.03
 
$
31

Exercised
 
(757
)
 
$
7.59

 
 
 
$
15

Outstanding and exercisable at December 31, 2011
 
1,051

 
$
9.84

 
1.41
 
$
13

___________________________________________
(a)
The intrinsic value of a stock option is the amount by which the current market value or the market value upon exercise of the underlying stock exceeds the exercise price of the option.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table presents a summary of our PSU awards as of December 31, 2013:
 
 
Units
 
Fair Value
as of
Grant Date
 
Fair Value
 
Liability for
Vested
Amount
 
 
 
 
($ in millions)
2012 Awards (a)
 
 
 
 
 
 
 
 
Payable 2014
 
278,083

 
$
8

 
$
11

 
$
11

Payable 2015
 
834,248

 
23

 
31

 
30

Total 2012 Awards
 
1,112,331

 
$
31

 
$
42

 
$
41

 
 
 
 
 
 
 
 
 
2013 Awards
 
 
 
 
 
 
 
 
Payable 2016
 
1,600,438

 
$
35

 
$
58

 
$
49

___________________________________________
(a)
In 2013, we paid $2 million related to 2012 PSU awards.
Schedule of Share-based Compensation, PSU Units, Activity [Table Text Block]
We recorded the following compensation related to PSUs during the years ended December 31, 2013, 2012 and 2011:
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
 
 
($ in millions)
Natural gas and oil properties
 
$
9

 
$
4

 
$
—

General and administrative expenses
 
34

 
8

 
—

Natural gas, oil and NGL production expenses
 
2

 
1

 
—

Marketing, gathering and compression expenses
 
2

 
1

 
—

Oilfield services expenses
 
1

 
—

 
—

Total
 
$
48

 
$
14

 
$
—