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Derivative and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2013 and 2012 are provided below. 
 
 
December 31, 2013
 
December 31, 2012
 
 
Volume    
 
Fair Value  
 
Volume    
 
Fair Value  
 
 
 
 
($ in millions)  
 
 
 
($ in millions)  
Natural gas (tbtu):
 
 
 
 
 
 
 
 
Fixed-price swaps
 
448

 
$
(23
)
 
49

 
$
24

Three-way collars
 
288

 
(7
)
 
—

 
—

Call options
 
193

 
(210
)
 
193

 
(240
)
Call swaptions
 
12

 
—

 
—

 
—

Basis protection swaps
 
68

 
3

 
111

 
(15
)
Total natural gas
 
1,009

 
(237
)
 
353

 
(231
)
Oil (mmbbl):
 
 
 
 
 
 
 
 
Fixed-price swaps
 
25.3

 
(50
)
 
28.1

 
68

Call options
 
42.5

 
(265
)
 
73.8

 
(748
)
Call swaptions
 
—

 
—

 
5.3

 
(13
)
Basis protection swaps
 
0.4

 
1

 
5.5

 
—

Total oil
 
68.2

 
(314
)
 
112.7

 
(693
)
Total estimated fair value
 
 
 
$
(551
)
 
 
 
$
(924
)
Schedule of Derivative Instruments [Table Text Block]
The components of natural gas, oil and NGL sales for the years ended December 31, 2013, 2012 and 2011 are presented below. 
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
 
 
($ in millions)
Natural gas, oil and NGL sales
 
$
6,923

 
$
5,359

 
$
5,259

Gains on natural gas, oil and NGL derivatives
 
129

 
919

 
772

Losses on ineffectiveness of cash flow hedges
 
—

 
—

 
(7
)
Total natural gas, oil and NGL sales
 
$
7,052

 
$
6,278

 
$
6,024
Schedule of Interest Rate Derivatives [Table Text Block]
The notional amount and the estimated fair value of our interest rate derivative liabilities as of December 31, 2013 and 2012 are provided below. 
 
 
December 31, 2013
 
December 31, 2012
 
 
Notional
Amount
 
Fair
Value
 
Notional
Amount
 
Fair
Value
 
 
 
 
($ in millions)
 
 
Interest rate swaps
 
$
2,250

 
$
(98
)
 
$
1,050

 
$
(35
)
Interest Income And Interest Expense Disclosure [Table Text Block]
The components of interest expense for the years ended 2013, 2012 and 2011 are presented below. 
 
 
Years Ended December 31,
 
 
2013
 
2012
 
2011
 
 
($ in millions)
Interest expense on senior notes
 
$
740

 
$
732

 
$
653

Interest expense on credit facilities
 
38

 
70

 
70

Interest expense on term loans
 
116

 
173

 
—

(Gains) losses on interest rate derivatives
 
58

 
(7
)
 
14

Amortization of loan discount, issuance costs and other
 
91

 
89

 
39

Capitalized interest
 
(816
)
 
(980
)
 
(732
)
Total interest expense
 
$
227

 
$
77

 
$
44
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 consolidated balance sheets as of December 31, 2013 and 2012 on a gross basis without regard to same-counterparty netting: 
 
 
 
 
Fair Value
 
 
 
 
December 31,
 
 
Balance Sheet Location
 
2013
 
2012
 
 
 
 
($ in millions)
Asset Derivatives:
 
 
 
 
 
 
Designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
Long-term derivative instruments
 
$
2

 
$
—

Total
 
 
 
2

 
—

 
 
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
Short-term derivative instruments
 
29

 
110

Commodity contracts
 
Long-term derivative instruments
 
11

 
5

Total
 
40

 
115

 
 
 
 
 
 
 
Liability Derivatives:
 
 
 
 
 
 
Designated as hedging instruments:
 
 
 
 
 
 
Foreign currency contracts
 
Long-term derivative instruments
 
—

 
(20
)
Total
 
—

 
(20
)
 
 
 
 
 
 
 
Not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
Short-term derivative instruments
 
(231
)
 
(157
)
Commodity contracts
 
Long-term derivative instruments
 
(362
)
 
(882
)
Interest rate contracts
 
Short-term derivative instruments
 
(6
)
 
—

Interest rate contracts
 
Long-term derivative instruments
 
(92
)
 
(35
)
Total
 
(691
)
 
(1,074
)
Total derivative instruments
 
$
(649
)
 
$
(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 in the consolidated balance sheets as of December 31, 2013 and December 31, 2012:
 
 
December 31, 2013
 
 
Derivative Assets
 
Derivative Liabilities
 
 
Short-
Term
 
Long-
Term
 
Short-
Term
 
Long-
Term
 
 
($ in millions)
Commodity Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
$
29

 
$
11

 
$
(231
)
 
$
(362
)
Gross amounts offset in the consolidated balance sheet
 
(29
)
 
(9
)
 
29

 
9

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

 
2

 
(202
)
 
(353
)
Interest Rate Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
—

 
—

 
(6
)
 
(92
)
Gross amounts offset in the consolidated balance sheet
 
—

 
—

 
—

 
—

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

 
—

 
(6
)
 
(92
)
Foreign Currency Contracts:
 
 
 
 
 
 
 
 
Gross amounts of recognized assets (liabilities)
 
—

 
2

 
—

 
—

Gross amounts offset in the consolidated balance sheet
 
—

 
—

 
—

 
—

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

 
2

 
—

 
—

 
 
 
 
 
 
 
 
 
Total derivatives as reported
 
$
—

 
$
4

 
$
(208
)
 
$
(445
)
 
 
 
 
 
 
 
 
 
 
 
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 our consolidated statements of operations for terminated instruments that were designated as fair value derivatives: 
 
 
 
 
Years Ended December 31,
Fair Value Derivatives 
 
Location of Gain (Loss)
 
2013
 
2012
 
2011
 
 
 
 
($ in millions)
Interest rate contracts
 
Interest expense
 
$
5

 
$
8

 
$
16
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
)
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: 
 
 
 
 
Years Ended December 31,
Cash Flow Derivatives
 
Location of Gain (Loss)
 
2013
 
2012
 
2011
 
 
 
 
($ in millions)
Gain (Loss) Recognized in AOCI (Effective Portion):
 
 
 
 
 
 
 
 
Commodity contracts
 
AOCI
 
$
—

 
$
—

 
$
392

Foreign currency contracts
 
AOCI
 
3

 
10

 
(24
)
 
 
 
 
$
3

 
$
10

 
$
368

Gain (Loss) Reclassified from AOCI (Effective Portion):
 
 
 
 
 
 
 
 
Commodity contracts
 
Natural gas, oil and NGL sales
 
$
(32
)
 
$
27

 
$
402

Foreign currency contracts
 
Interest expense
 
—

 
—

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

 
—

 
(20
)
 
 
 
 
$
(32
)
 
$
27

 
$
364

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

 
$
—

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

 
—

 
22

 
 
 
 
$
—

 
$
—

 
$
15
Derivatives Not Designated As Hedging Instruments Disclosure [Table Text Block]
The following table presents the gain (loss) recognized in our 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)
 
2013
 
2012
 
2011
 
 
 
 
($ in millions)
Commodity contracts
 
Natural gas, oil and NGL
 
$
159

 
$
892

 
$
348

Interest rate contracts
 
Interest expense
 
(63
)
 
(1
)
 
(12
)
Total
 
$
96

 
$
891

 
$
336