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Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Text Block [Abstract]  
Common Stock [Table Text Block]
The following is a summary of the changes in our common shares issued for 2013, 2012 and 2011:
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
 
 
(in thousands)
Shares issued as of January 1
 
666,468

 
660,888

 
655,251

Restricted stock issuances (net of forfeitures)(a)
 
(599
)
 
5,038

 
4,961

Stock option exercises
 
323

 
542

 
565

Preferred stock conversion
 
—

 
—

 
111

Shares issued as of December 31
 
666,192

 
666,468

 
660,888

___________________________________________
(a)
In 2013, we began granting restricted stock units (RSUs) in lieu of restricted stock awards (RSAs) to non-employee directors and employees. Shares of common stock underlying RSUs are issued when the units vest, whereas restricted shares of common stock are issued on the grant date of RSAs. We refer to RSAs and RSUs collectively as restricted stock.
Schedule of Preferred Stock Summary and Conversion Terms [Table Text Block]
Following is a summary of our preferred stock, including the primary conversion terms as of December 31, 2013:
Preferred Stock Series
 
Issue Date
 
Liquidation
Preference
per Share
 
Holder's Conversion Right
 
Conversion Rate
 
Conversion Price
 
Company's
Conversion
Right From
 
Company's Market Conversion Trigger(a)
5.75% cumulative
convertible
non-voting
 
May and
June 2010
 
$
1,000

 
Any time
 
37.1850
 
$
26.8926

 
May 17, 2015
 
$
34.9604

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5.75% (series A)
cumulative
convertible
non-voting
 
May
2010
 
$
1,000

 
Any time
 
35.9339
 
$
27.8289

 
May 17, 2015
 
$
36.1776

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4.50% cumulative convertible
 
September 2005
 
$
100

 
Any time
 
2.2969
 
$
43.5375

 
September 15, 2010
 
$
56.5988

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5.00% cumulative convertible (series 2005B)
 
November 2005
 
$
100

 
Any time
 
2.5990
 
$
38.4757

 
November 15, 2010
 
$
50.0184

___________________________________________
(a)
Convertible at the Company's option if the trading price of the Company's common stock equals or exceeds the trigger price for a specified time period or after the conversion date indicated if there are less than 250,000 shares of 4.50% or 5.00% (series 2005B) preferred stock outstanding or 25,000 shares of 5.75% or 5.75% (series A) preferred stock outstanding.
Preferred Stock Shares Outstanding [Table Text Block]
The following reflects the shares outstanding of our preferred stock for 2013, 2012 and 2011:
 
 
5.75%
 
5.75% (A)
 
4.50%
 
5.00%
(2005B)  
 
 
(in thousands)
Shares outstanding as of January 1, 2013 and December 31, 2013
 
1,497

 
1,100

 
2,559

 
2,096

 
 
 
 
 
 
 
 
 
Shares outstanding as of January 1, 2012 and December 31, 2012
 
1,497

 
1,100

 
2,559

 
2,096

 
 
 
 
 
 
 
 
 
Shares outstanding as of January 1, 2011
 
1,500

 
1,100

 
2,559

 
2,096

Conversion of preferred shares into common stock
 
(3
)
 
—

 
—

 
—

Shares outstanding at December 31, 2011
 
1,497

 
1,100

 
2,559

 
2,096
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
For the year ended December 31, 2013, changes in accumulated other comprehensive income (loss) by component, net of tax, are detailed below.
 
 
Net Gains
(Losses) on
Cash Flow
Hedges
 
Net Gains
(Losses)
on
Investments
 
Total
 
 
($ in millions)
Balance, December 31, 2012
 
$
(189
)
 
$
7

 
$
(182
)
Other comprehensive income before reclassifications
 
2

 
(6
)
 
(4
)
Amounts reclassified from accumulated other comprehensive income
 
20

 
4

 
24

Net current period other comprehensive income
 
22

 
(2
)
 
20

Balance, December 31, 2013
 
$
(167
)
 
$
5

 
$
(162
)
A reconciliation of the changes in accumulated other comprehensive income (loss) in our consolidated statements of stockholders’ equity related to our cash flow hedges is presented below. 
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
 
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
 
($ in millions)
Balance, beginning of period
 
$
(304
)
 
$
(189
)
 
$
(287
)
 
$
(178
)
 
$
(291
)
 
$
(181
)
Net change in fair value
 
3

 
2

 
10

 
6

 
368

 
228

(Gains) losses reclassified to income
 
32

 
20

 
(27
)
 
(17
)
 
(364
)
 
(225
)
Balance, end of period
 
$
(269
)
 
$
(167
)
 
$
(304
)
 
$
(189
)
 
$
(287
)
 
$
(178
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
For the year ended December 31, 2013, amounts reclassified from accumulated other comprehensive income (loss), net of tax, into the consolidated statement of operations are detailed below.
Details About Accumulated
Other Comprehensive
Income (Loss) Components
 
Affected Line Item
in the Statement
Where Net Income is Presented
 
Year Ended
December 31, 2013
 
 
 
 
($ in millions)
Net losses on cash flow hedges:
 
 
 
 
Commodity contracts
 
Natural gas, oil and NGL revenues
 
$
20

Investments:
 
 
 
 
Impairment of investment
 
Impairment of investment
 
6

Sale of investment
 
Gain on sale of investment
 
(2
)
Total reclassifications for the period, net of tax
 
$
24
Distributions Made to Limited Partner, by Distribution [Table Text Block]
For the years ended December 31, 2013 and 2012, the Trust declared and paid the following distributions:
Production Period

Distribution Date

Cash Distribution
per
Common Unit

Cash Distribution
per
Subordinated Unit
June 2013 - August 2013
 
November 29, 2013
 
$
0.6671

 
$
—

March 2013 - May 2013

August 29, 2013

$
0.6900


$
0.1432

December 2012 - February 2013

May 31, 2013

$
0.6900


$
0.3010

September 2012 - November 2012

March 1, 2013

$
0.6700


$
0.3772

June 2012 - August 2012
 
November 29, 2012
 
$
0.6300

 
$
0.2208

March 2012 - May 2012
 
August 30, 2012
 
$
0.6100

 
$
0.4819

December 2011 - February 2012

May 31, 2012

$
0.6588


$
0.6588

September 2011 - November 2011

March 1, 2012

$
0.7277


$
0.7277