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Derivative and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2012
Text Block [Abstract]  
Oil And Gas Production/Processing Derivative Activities Disclosure
The estimated fair values of our natural gas, oil and NGL derivative instruments as of December 31, 2012 and 2011 are provided below. 
 
 
December 31, 2012
 
December 31, 2011
 
 
Volume    
 
Fair Value  
 
Volume    
 
Fair Value  
 
 
 
 
($ in millions)  
 
 
 
($ in millions)  
Natural gas (tbtu):
 
 
 
 
 
 
 
 
Fixed-price swaps
 
49

 
$
24

 
—

 
$
—

Call options
 
193

 
(240
)
 
1,357

 
(284
)
Basis protection swaps
 
111

 
(15
)
 
106

 
(42
)
Total natural gas
 
353

 
(231
)
 
1,463

 
(326
)
Oil (mmbbl):
 
 
 
 
 
 
 
 
Fixed-price swaps
 
28.1

 
68

 
14.9

 
15

Call options
 
73.8

 
(748
)
 
94.7

 
(1,282
)
Call swaptions
 
5.3

 
(13
)
 
7.8

 
(53
)
Basis protection swaps
 
5.5

 
—

 
—

 
—

Fixed-price knockout swaps
 
—

 
—

 
0.8

 
7

Total oil
 
112.7

 
(693
)
 
118.2

 
(1,313
)
Total estimated fair value
 
 
 
$
(924
)
 
 
 
$
(1,639
)
Schedule Of Components Of Natural Gas And Oil Sales [Table Text Block]
The components of natural gas, oil and NGL sales for the years ended December 31, 2012, 2011 and 2010 are presented below. 
 
 
Years Ended December 31,
 
 
2012
 
2011
 
2010
 
 
($ in millions)
Natural gas, oil and NGL sales
 
$
5,359

 
$
5,259

 
$
4,248

Gains (losses) on natural gas, oil and NGL derivatives
 
919

 
772

 
1,422

Gains (losses) on ineffectiveness of cash flow hedges
 
—

 
(7
)
 
(23
)
Total natural gas, oil and NGL sales
 
$
6,278

 
$
6,024

 
$
5,647
Interest Rate Derivatives Outstanding
The notional amount and the estimated fair value of our interest rate derivatives outstanding as of December 31, 2012 and 2011 are provided below. 
 
 
December 31, 2012
 
December 31, 2011
 
 
Notional
Amount    
 
Fair
Value      
 
Notional
Amount    
 
Fair
Value      
 
 
 
 
($ in millions)
 
 
Interest rate:
 
 
 
 
 
 
 
 
Swaps
 
$
1,050

 
$
(35
)
 
$
1,050

 
$
(42
)
Swaptions
 
—

 
—

 
300

 
—

Totals
 
$
1,050

 
$
(35
)
 
$
1,350

 
$
(42
)
Interest Income And Interest Expense Disclosure
The components of interest expense for the years ended 2012, 2011 and 2010 are presented below. 
 
 
Years Ended December 31,
 
 
2012
 
2011
 
2010
 
 
($ in millions)
Interest expense on senior notes
 
$
732

 
$
653

 
$
718

Interest expense on credit facilities
 
70

 
70

 
61

Interest expense on term loans
 
173

 
—

 
—

(Gains) losses on interest rate derivatives
 
(7
)
 
14

 
(80
)
Amortization of loan discount, issuance costs and other
 
89

 
39

 
36

Capitalized interest
 
(980
)
 
(732
)
 
(716
)
Total interest expense
 
$
77

 
$
44

 
$
19
Schedule Of Derivative Instruments In Condensed Consolidated Balance Sheets
The following table presents the fair value and location of each classification of derivative instrument disclosed in the consolidated balance sheets as of December 31, 2012 and 2011 on a gross basis without regard to same-counterparty netting: 
 
 
 
 
Fair Value
 
 
 
 
December 31,
 
 
Balance Sheet Location
 
2012
 
2011
 
 
 
 
($ in millions)
Asset Derivatives:
 
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
Short-term derivative instruments
 
$
110

 
$
54

Commodity contracts
 
Long-term derivative instruments
 
5

 
1

Total
 
115

 
55

 
 
 
 
 
 
 
Liability Derivatives:
 
 
 
 
 
 
Designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
Long-term derivative instruments
 
(20
)
 
(38
)
Total
 
(20
)
 
(38
)
 
 
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
Short-term derivative instruments
 
(157
)
 
(232
)
Commodity contracts
 
Long-term derivative instruments
 
(882
)
 
(1,462
)
Interest rate contracts
 
Long-term derivative instruments
 
(35
)
 
(42
)
Total
 
(1,074
)
 
(1,736
)
Total derivative instruments
 
$
(979
)
 
$
(1,719
)
Schedule Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance
The following table presents the gain (loss) recognized in the consolidated statements of operations for terminated instruments designated as fair value derivatives: 
 
 
 
 
Years Ended December 31,
Fair Value Derivatives 
 
Location of Gain (Loss)
 
2012
 
2011
 
2010
 
 
 
 
($ in millions)
Interest rate contracts
 
Interest expense
 
$
8

 
$
16

 
$
20
Reconciliation Of Components Of Accumulated Other Comprehensive Income (Loss)
A reconciliation of the changes of accumulated other comprehensive income (loss) in the consolidated statements of stockholders’ equity related to our cash flow hedges is presented below. 
 
 
Years Ended December 31,
 
 
2012
 
2011
 
2010
 
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
Before 
Tax  
 
After 
Tax  
 
 
($ in millions)
Balance, beginning of period
 
$
(287
)
 
$
(178
)
 
$
(291
)
 
$
(181
)
 
$
134

 
$
84

Net change in fair value
 
10

 
6

 
368

 
228

 
364

 
226

Gains reclassified to income
 
(27
)
 
(17
)
 
(364
)
 
(225
)
 
(789
)
 
(491
)
Balance, end of period
 
$
(304
)
 
$
(189
)
 
$
(287
)
 
$
(178
)
 
$
(291
)
 
$
(181
)
Schedule Of Cash Flow Hedge Instruments, Gain (Loss) In Statement Of Financial Performance
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: 
 
 
 
 
Years Ended December 31,
Cash Flow Derivatives
 
Location of Gain (Loss)
 
2012
 
2011
 
2010
 
 
 
 
($ in millions)
Gain (Loss) Recognized in AOCI (Effective Portion):
 
 
 
 
 
 
 
 
Commodity contracts
 
AOCI
 
$
—

 
$
392

 
$
386

Foreign currency contracts
 
AOCI
 
10

 
(24
)
 
(22
)
 
 
 
 
$
10

 
$
368

 
$
364

Gain (Loss) Reclassified from AOCI (Effective Portion):
 
 
 
 
 
 
 
 
Commodity contracts
 
Natural gas, oil and NGL sales
 
$
27

 
$
402

 
$
789

Foreign currency contracts
 
Interest expense
 
—

 
(18
)
 
—

Foreign currency contracts
 
Loss on purchase of debt
 
—

 
(20
)
 
—

 
 
 
 
$
27

 
$
364

 
$
789

Gain (Loss) Recognized in Income
 
 
 
 
 
 
 
 
Commodity contracts:
 
 
 
 
 
 
 
 
Ineffective portion
 
Natural gas, oil and NGL sales
 
$
—

 
$
(7
)
 
$
(23
)
Amount initially excluded from effectiveness testing
 
Natural gas, oil and NGL sales
 
—

 
22

 
4

 
 
 
 
$
—

 
$
15

 
$
(19
)
Derivatives Not Designated As Hedging Instruments Disclosure
The following table presents the gain (loss) recognized in the consolidated statements of operations for instruments not designated as either cash flow or fair value hedges: 
 
 
 
 
Years Ended December 31,
Derivative Contracts
 
Location of Gain (Loss)
 
2012
 
2011
 
2010
 
 
 
 
($ in millions)
Commodity contracts
 
Natural gas, oil and NGL sales
 
$
892

 
$
348

 
$
629

Interest rate contracts
 
Interest expense
 
(1
)
 
(12
)
 
60

Total
 
$
891

 
$
336

 
$
689