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Derivative and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2013
Text Block [Abstract]  
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
The estimated fair values of our natural gas and oil derivative instrument assets (liabilities) as of September 30, 2013 and December 31, 2012 are provided below. 
 
 
September 30, 2013
 
December 31, 2012
 
 
Volume    
 
Fair Value  
 
Volume    
 
Fair Value  
 
 
 
 
($ in millions)  
 
 
 
($ in millions)  
Natural gas (tbtu):
 
 
 
 
 
 
 
 
Fixed-price swaps
 
341

 
$
96

 
49

 
$
24

Call options
 
193

 
(219
)
 
193

 
(240
)
Call swaptions
 
12

 
—

 
—

 
—

Basis protection swaps
 
79

 
(2
)
 
111

 
(15
)
Three-way collars
 
36

 
4

 
—

 
—

Total natural gas
 
661

 
(121
)
 
353

 
(231
)
Oil (mmbbl):
 
 
 
 
 
 
 
 
Fixed-price swaps
 
31.6

 
(94
)
 
28.1

 
68

Call options
 
65.6

 
(368
)
 
73.8

 
(748
)
Call swaptions
 
5.3

 
(1
)
 
5.3

 
(13
)
Basis protection swaps
 
0.5

 
1

 
5.5

 
—

Total oil
 
103.0

 
(462
)
 
112.7

 
(693
)
Total estimated fair value
 
 
 
$
(583
)
 
 
 
$
(924
)
Schedule of Derivative Instruments [Table Text Block]
The components of natural gas, oil and NGL sales for the Current Quarter, the Prior Quarter, the Current Period and the Prior Period are presented below. 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
($ in millions)
Natural gas, oil and NGL sales
 
$
1,839

 
$
1,464

 
$
5,303

 
$
3,798

Gains (losses) on natural gas, oil and NGL derivatives
 
(253
)
 
(27
)
 
141

 
824

Total natural gas, oil and NGL sales
 
$
1,586

 
$
1,437

 
$
5,444

 
$
4,622
Schedule of Interest Rate Derivatives [Table Text Block]
The notional amount and the estimated fair value of our interest rate derivative liabilities as of September 30, 2013 and December 31, 2012 are provided below. 
 
 
September 30, 2013
 
December 31, 2012
 
 
Notional
Amount
 
Fair
Value
 
Notional
Amount
 
Fair
Value
 
 
 
 
($ in millions)
 
 
Interest rate swaps
 
$
2,500

 
$
(88
)
 
$
1,050

 
$
(35
)
Interest Income And Interest Expense Disclosure [Table Text Block]
The components of interest expense for the Current Quarter, the Prior Quarter, the Current Period and the Prior Period are presented below. 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
($ in millions)
Interest expense on senior notes
 
$
180

 
$
187

 
$
560

 
$
546

Interest expense on credit facilities
 
8

 
13

 
30

 
51

Interest expense on term loans
 
29

 
112

 
87

 
173

(Gains) losses on interest rate derivatives
 
(3
)
 
(2
)
 
51

 
(4
)
Amortization of loan discount, issuance costs and other
 
21

 
24

 
70

 
67

Capitalized interest
 
(195
)
 
(298
)
 
(634
)
 
(770
)
Total interest expense
 
$
40

 
$
36

 
$
164

 
$
63
Schedule Of Derivative Instruments In Condensed Consolidated Balance Sheets [Table Text Block]
The following table presents the fair value and location of each classification of derivative instrument disclosed in the condensed consolidated balance sheets as of September 30, 2013 and December 31, 2012 on a gross basis without regard to same-counterparty netting: 
 
 
 
 
Fair Value
 
 
Balance Sheet Location
 
September 30,
2013
 
December 31,
2012
 
 
 
 
($ in millions)
Asset Derivatives:
 
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
Short-term derivative instruments
 
$
115

 
$
110

Commodity contracts
 
Long-term derivative instruments
 
11

 
5

Total
 
126

 
115

 
 
 
 
 
 
 
Liability Derivatives:
 
 
 
 
 
 
Designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
Long-term derivative instruments
 
(5
)
 
(20
)
Total
 
(5
)
 
(20
)
 
 
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
Short-term derivative instruments
 
(265
)
 
(157
)
Commodity contracts
 
Long-term derivative instruments
 
(444
)
 
(882
)
Interest rate contracts
 
Short-term derivative instruments
 
(9
)
 
—

Interest rate contracts
 
Long-term derivative instruments
 
(79
)
 
(35
)
Total
 
(797
)
 
(1,074
)
Total derivative instruments
 
$
(676
)
 
$
(979
)
Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block]
The following tables present the netting offsets of derivative assets and liabilities as of September 30, 2013 and December 31, 2012:
 
 
September 30, 2013
 
 
Derivative Assets
 
Derivative Liabilities
 
 
Short-
Term
 
Long-
Term
 
Short-
Term
 
Long-
Term
 
 
($ in millions)
Commodity Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
$
115

 
$
11

 
$
(265
)
 
$
(444
)
Gross amounts offset in the condensed consolidated
balance sheet
 
(104
)
 
(9
)
 
104

 
9

Net amounts of assets (liabilities) presented in the
condensed consolidated balance sheet
 
11

 
2

 
(161
)
 
(435
)
Interest Rate Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
—

 
—

 
(9
)
 
(79
)
Gross amounts offset in the condensed consolidated
balance sheet
 
—

 
—

 
—

 
—

Net amounts of assets (liabilities) presented in the
condensed consolidated balance sheet
 
—

 
—

 
(9
)
 
(79
)
Foreign Currency Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
—

 
—

 
—

 
(5
)
Gross amounts offset in the condensed consolidated
balance sheet
 
—

 
—

 
—

 
—

Net amounts of assets (liabilities) presented in the
condensed consolidated balance sheet
 
—

 
—

 
—

 
(5
)
 
 
 
 
 
 
 
 
 
Total derivatives as reported
 
$
11

 
$
2

 
$
(170
)
 
$
(519
)
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012
 
 
Derivative Assets
 
Derivative Liabilities
 
 
Short-
Term
 
Long-
Term
 
Short-
Term
 
Long-
Term
 
 
($ in millions)
Commodity Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
$
110

 
$
5

 
$
(157
)
 
$
(882
)
Gross amounts offset in the consolidated balance sheet
 
(52
)
 
(3
)
 
52

 
3

Net amounts of assets (liabilities) presented in the
consolidated balance sheet
 
58

 
2

 
(105
)
 
(879
)
Interest Rate Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
—

 
—

 
—

 
(35
)
Gross amounts offset in the consolidated balance sheet
 
—

 
—

 
—

 
—

Net amounts of assets (liabilities) presented in the
consolidated balance sheet
 
—

 
—

 
—

 
(35
)
Foreign Currency Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
—

 
—

 
—

 
(20
)
Gross amounts offset in the consolidated balance sheet
 
—

 
—

 
—

 
—

Net amounts of assets (liabilities) presented in the
consolidated balance sheet
 
—

 
—

 
—

 
(20
)
 
 
 
 
 
 
 
 
 
Total derivatives as reported
 
$
58

 
$
2

 
$
(105
)
 
$
(934
)
Schedule Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance [Table Text Block]
The following table presents the gain (loss) recognized in the condensed consolidated statements of operations for terminated instruments that were designated as fair value derivatives: 
 
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
Fair Value Derivatives 
 
Location of Gain (Loss)
 
2013
 
2012
 
2013
 
2012
 
 
 
 
($ in millions)
Interest rate contracts
 
Interest expense
 
$
1

 
$
2

 
$
4

 
$
6
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Income (Loss)
For the Current Period, 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
 
13

 
4

 
17

Net current period other comprehensive income
 
15

 
(2
)
 
13

Balance, September 30, 2013
 
$
(174
)
 
$
5

 
$
(169
)
A reconciliation of the changes of accumulated other comprehensive income (loss) in the condensed consolidated statements of stockholders’ equity related to our cash flow hedges is presented below. 
 
 
Three Months Ended
September 30,
 
 
2013
 
2012
 
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
 
($ in millions)
Balance, beginning of period
 
$
(286
)
 
$
(178
)
 
$
(306
)
 
$
(190
)
Net change in fair value
 
3

 
2

 
4

 
3

(Gains) losses reclassified to income
 
3

 
2

 
(9
)
 
(6
)
Balance, end of period
 
$
(280
)
 
$
(174
)
 
$
(311
)
 
$
(193
)
 
 
Nine Months Ended
September 30,
 
 
2013
 
2012
 
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
 
($ in millions)
Balance, beginning of period
 
$
(304
)
 
$
(189
)
 
$
(287
)
 
$
(178
)
Net change in fair value
 
3

 
2

 
4

 
3

(Gains) losses reclassified to income
 
21

 
13

 
(28
)
 
(18
)
Balance, end of period
 
$
(280
)
 
$
(174
)
 
$
(311
)
 
$
(193
)
Schedule Of Cash Flow Hedge Hedges Included in AOCI [Table Text Block]
The following table presents the pre-tax gain (loss) recognized in, and reclassified from, accumulated other comprehensive income (AOCI) related to instruments designated as cash flow derivatives: 
 
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
Cash Flow Derivatives
 
Location of Gain (Loss)
 
2013
 
2012
 
2013
 
2012
 
 
 
 
($ in millions)
Gain (Loss) Recognized in AOCI (Effective Portion):
 
 
 
 
 
 
 
 
 
 
Foreign currency
contracts
 
AOCI
 
$
3

 
$
4

 
$
3

 
$
4

 
 
 
 
$
3

 
$
4

 
$
3

 
$
4

Gain (Loss) Reclassified from AOCI (Effective Portion):
 
 
 
 
 
 
 
 
 
 
Commodity
contracts
 
Natural gas, oil and
NGL sales
 
$
(3
)
 
$
9

 
$
(21
)
 
$
28

 
 
 
 
$
(3
)
 
$
9

 
$
(21
)
 
$
28
Derivatives Not Designated As Hedging Instruments Disclosure [Table Text Block]
The following table presents the gain (loss) recognized in the condensed consolidated statements of operations for instruments not designated as either cash flow or fair value hedges: 
 
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
Derivative Contracts
 
Location of Gain (Loss)
 
2013
 
2012
 
2013
 
2012
 
 
 
 
($ in millions)
Commodity contracts
 
Natural gas, oil and
NGL sales
 
$
(250
)
 
$
(36
)
 
$
162

 
$
796

Interest rate contracts
 
Interest expense
 
2

 
—

 
(55
)
 
(2
)
Total
 
$
(248
)
 
$
(36
)
 
$
107

 
$
794