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Derivative and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2012
Text Block [Abstract]  
Oil And Gas Production/Processing Derivative Activities Disclosure
All of our derivative instruments are net settled based on the difference between the fixed-price payment and the flo
Schedule Of Components Of Natural Gas And Oil Sales [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,
 
2012
 
2011
 
2012
 
2011
 
 
 
($ in millions)
 
 
Natural gas, oil and NGL sales
$
1,464

 
$
1,427

 
$
3,798

 
$
3,892

Gains (losses) on natural gas, oil and NGL derivatives
(27
)
 
980

 
824

 
783

Gains (losses) on ineffectiveness of cash flow hedges
—

 
(5
)
 
—

 
13

Total natural gas, oil and NGL sales
$
1,437

 
$
2,402

 
$
4,622

 
$
4,688
Interest Rate Derivatives Outstanding
The notional amount and the estimated fair value of our interest rate derivatives outstanding as of September 30, 2012 and December 31, 2011 are provided below. 
 
September 30, 2012
 
December 31, 2011
 
Notional
Amount    
 
Fair
Value      
 
Notional
Amount    
 
Fair
Value      
 
 
 
($ in millions)
 
 
Interest rate:
 
 
 
 
 
 
 
Swaps
$
1,050

 
$
(39
)
 
$
1,050

 
$
(42
)
Swaptions
500

 
(2
)
 
300

 
—

Totals
$
1,550

 
$
(41
)
 
$
1,350

 
$
(42
)
Interest Income And Interest Expense Disclosure
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,
 
2012
 
2011
 
2012
 
2011
 
 
 
($ in millions)
 
 
Interest expense on senior notes
$
187

 
$
152

 
$
546

 
$
494

Interest expense on credit facilities
13

 
18

 
51

 
49

Interest expense on term loans
112

 
—

 
173

 
—

(Gains) losses on interest rate derivatives
(2
)
 
—

 
(4
)
 
19

Amortization of loan discount and other
24

 
8

 
67

 
30

Capitalized interest
(298
)
 
(174
)
 
(770
)
 
(555
)
Total interest expense
$
36

 
$
4

 
$
63

 
$
37
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 condensed consolidated balance sheets as of September 30, 2012 and December 31, 2011 on a gross basis without regard to same-counterparty netting: 
 
 
 
Fair Value
 
Balance Sheet Location
 
September 30, 2012
 
December 31, 2011
 
 
 
($ in millions)
Asset Derivatives:
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
Commodity contracts
Short-term derivative instruments
 
$
108

 
$
54

Commodity contracts
Long-term derivative instruments
 
36

 
1

Total
 
144

 
55

Liability Derivatives:
 
 
 
 
 
Designated as hedging instruments:
 
 
 
 
 
Foreign currency contracts
Long-term derivative instruments
 
(37
)
 
(38
)
Total
 
(37
)
 
(38
)
Not designated as hedging instruments:
 
 
 
 
 
Commodity contracts
Short-term derivative instruments
 
(225
)
 
(232
)
Commodity contracts
Long-term derivative instruments
 
(953
)
 
(1,462
)
Interest rate contracts
Short-term derivative instruments
 
(2
)
 
—

Interest rate contracts
Long-term derivative instruments
 
(39
)
 
(42
)
Total
 
(1,219
)
 
(1,736
)
Total derivative instruments
 
$
(1,112
)
 
$
(1,719
)
Schedule Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance
The following table presents the gain (loss) recognized in the condensed consolidated statements of operations for terminated instruments designated as fair value derivatives: 
 
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
Fair Value Derivatives 
 
Location of Gain (Loss)
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
($ in millions)
 
 
Interest rate contracts
 
Interest expense
 
$
2

 
$
3

 
$
6

 
$
14
Reconciliation Of Components Of Accumulated Other Comprehensive Income (Loss)
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,
 
2012
 
2011
 
Before Tax  
 
After Tax  
 
Before Tax  
 
After Tax  
 
 
 
($ in millions)
 
 
Balance, beginning of period
$
(306
)
 
$
(190
)
 
$
(177
)
 
$
(110
)
Net change in fair value
4

 
3

 
121

 
75

Gains reclassified to income
(9
)
 
(6
)
 
(129
)
 
(80
)
Balance, end of period
$
(311
)
 
$
(193
)
 
$
(185
)
 
$
(115
)
 
 
 
 
 
 
 
 
 
Nine Months Ended
September 30,
 
2012
 
2011
 
Before Tax  
 
After Tax  
 
Before Tax  
 
After Tax  
 
 
 
($ in millions)
 
 
Balance, beginning of period
$
(287
)
 
$
(178
)
 
$
(291
)
 
$
(181
)
Net change in fair value
4

 
3

 
338

 
210

Gains reclassified to income
(28
)
 
(18
)
 
(232
)
 
(144
)
Balance, end of period
$
(311
)
 
$
(193
)
 
$
(185
)
 
$
(115
)
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: 
 
 
 
 
Three Months Ended
 September 30,
 
Nine Months Ended
September 30,
 
 
 
 
Cash Flow Derivatives
 
Location of Gain (Loss)
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
($ in millions)
 
 
Gain (Loss) Recognized in AOCI (Effective Portion):
 
 
 
 
 
 
 
 
 
 
Commodity contracts
 
AOCI
 
$
—

 
$
122

 
$
—

 
$
372

Foreign currency contracts
 
AOCI
 
4

 
(1
)
 
4

 
(34
)
 
 
 
 
$
4

 
$
121

 
$
4

 
$
338

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

 
$
129

 
$
28

 
$
270

Foreign currency contracts
 
Interest expense
 
—

 
—

 
—

 
(18
)
Foreign currency contracts
 
Loss on purchase of debt
 
—

 
—

 
—

 
(20
)
 
 
 
 
$
9

 
$
129

 
$
28

 
$
232

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

 
$
(5
)
 
$
—

 
$
13

Amount initially excluded from effectiveness testing
 
Natural gas, oil and NGL sales
 
—

 
—

 
—

 
22

 
 
 
 
$
—

 
$
(5
)
 
$
—

 
$
35
Derivatives Not Designated As Hedging Instruments Disclosure
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 derivatives: 
 
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
Derivative Contracts
 
Location of Gain (Loss)
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
($ in millions)
 
 
Commodity contracts
 
Natural gas, oil and NGL sales
 
$
(36
)
 
$
851

 
$
796

 
$
491

Interest rate contracts
 
Interest expense
 
—

 
(3
)
 
(2
)
 
(14
)
Total
 
$
(36
)
 
$
848

 
$
794

 
$
477