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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-Based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of the changes in unvested restricted stock during the Current Quarter is presented below.
 
 
Shares of
Unvested
Restricted Stock
 
Weighted Average
Grant Date
Fair Value
 
 
(in thousands)
 
 
Unvested restricted stock as of January 1, 2015
 
10,091

 
$
21.20

Granted
 
6,672

 
$
14.11

Vested
 
(2,490
)
 
$
17.01

Forfeited
 
(142
)
 
$
16.30

Unvested restricted stock as of March 31, 2015
 
14,131

 
$
18.64
Equity-Classified Share-Based Payment Award Valuation Assumptions [Table Text Block]
For the Current Quarter awards, the Company utilized the Monte Carlo simulation for the TSR performance measure, and the following assumptions to determine the grant date fair value of the PSUs:
Volatility
 
40.12
%
Risk-free interest rate
 
0.95
%
Dividend yield for value of awards
 
1.91
%
The Company used the following weighted average assumptions to estimate the grant date fair value of the stock options granted in the Current Quarter:
Expected option life – years
 
4.5

Volatility
 
39.91
%
Risk-free interest rate
 
1.33
%
Dividend yield
 
1.91
%
Schedule of Share-Based Compensation, Stock Options, Activity [Table Text Block]
The following table provides information related to stock option activity for the Current Quarter: 
 
 
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, 2015
 
4,599

 
$
19.55

 
7.03
 
$
5

Granted
 
1,208

 
$
18.37

 
 
 
 
Exercised
 
(14
)
 
$
18.13

 
 
 
$
—

Expired
 
—

 
$
—

 
 
 
 
Forfeited
 
—

 
$
—

 
 
 
 
Outstanding at March 31, 2015
 
5,793

 
$
19.31

 
6.83
 
$
—

 
 
 
 
 
 
 
 
 
Exercisable at March 31, 2015
 
1,930

 
$
19.29

 
5.84
 
$
—

___________________________________________
(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.
Equity-Classified Stock-Based Compensation [Table Text Block]
We recognized the following compensation costs related to restricted stock and stock options for the Current Quarter and the Prior Quarter:
 
 
Three Months Ended
March 31,
 
 
2015
 
2014
 
 
($ in millions)
General and administrative expenses
 
$
12

 
$
12

Oil and natural gas properties
 
7

 
7

Oil, natural gas and NGL production expenses
 
4

 
4

Marketing, gathering and compression expenses
 
1

 
2

Oilfield services expenses
 
—

 
2

Total
 
$
24

 
$
27

We recognized the following compensation costs (credits) related to PSUs for the Current Quarter and the Prior Quarter:
 
 
Three Months Ended
March 31,
 
 
2015
 
2014
 
 
($ in millions)
General and administrative expenses
 
$
(10
)
 
$
(1
)
Restructuring and other termination costs
 
(10
)
 
(9
)
Oil and natural gas properties
 
(1
)
 
1

Total
 
$
(21
)
 
$
(9
)
Liability-Classified Share-Based Payment Award Valuation Assumptions [Table Text Block]
For the Current Quarter awards, the Company utilized the Monte Carlo simulation for the TSR performance measure, and the following assumptions to determine the grant date fair value of the PSUs:
Volatility
 
40.12
%
Risk-free interest rate
 
0.95
%
Dividend yield for value of awards
 
1.91
%
The Company used the following weighted average assumptions to estimate the grant date fair value of the stock options granted in the Current Quarter:
Expected option life – years
 
4.5

Volatility
 
39.91
%
Risk-free interest rate
 
1.33
%
Dividend yield
 
1.91
%
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table presents a summary of our 2013, 2014 and 2015 PSU awards:
 
 
Units
 
Fair Value
as of
Grant Date
 
Fair Value(a)
 
Liability for
Vested
Amount(a)
 
 
 
 
($ in millions)
2013 Awards:
 
 
 
 
 
 
 
 
Payable 2016
 
1,701,941

 
$
35

 
$
21

 
$
21

 
 
 
 
 
 
 
 
 
2014 Awards:
 
 
 
 
 
 
 
 
Payable 2017
 
609,637

 
$
16

 
$
3

 
$
3

 
 
 
 
 
 
 
 
 
2015 Awards:
 
 
 
 
 
 
 
 
Payable 2018
 
696,683

 
$
13

 
$
8

 
$
2

___________________________________________
(a)
As of March 31, 2015.
Liability-Classified Stock-Based Compensation [Table Text Block]
We recognized the following compensation costs related to restricted stock and stock options for the Current Quarter and the Prior Quarter:
 
 
Three Months Ended
March 31,
 
 
2015
 
2014
 
 
($ in millions)
General and administrative expenses
 
$
12

 
$
12

Oil and natural gas properties
 
7

 
7

Oil, natural gas and NGL production expenses
 
4

 
4

Marketing, gathering and compression expenses
 
1

 
2

Oilfield services expenses
 
—

 
2

Total
 
$
24

 
$
27

We recognized the following compensation costs (credits) related to PSUs for the Current Quarter and the Prior Quarter:
 
 
Three Months Ended
March 31,
 
 
2015
 
2014
 
 
($ in millions)
General and administrative expenses
 
$
(10
)
 
$
(1
)
Restructuring and other termination costs
 
(10
)
 
(9
)
Oil and natural gas properties
 
(1
)
 
1

Total
 
$
(21
)
 
$
(9
)