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Financial and Other Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair value of derivative instruments
The following tables present the fair value of derivative instruments as of March 31, 2013 and December 31, 2012:
 
March 31, 2013
 
December 31, 2012
 
Derivative
Assets
 
Derivative Liabilities
 
Derivative
Assets
 
Derivative Liabilities
 
(In millions)
Derivatives designated as hedging instruments:
 
 
 
 
 
 
 
Interest rate contracts
$
—

 
$
(1
)
 
$
—

 
$
(1
)
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 

 
 

Natural Gas
539

 
(617
)
 
645

 
(661
)
Electricity
308

 
(307
)
 
360

 
(351
)
Other
23

 
(19
)
 
11

 
(7
)
Total derivatives not designated as hedging instruments:
$
870

 
$
(943
)
 
$
1,016

 
$
(1,019
)
Total derivatives:
 
 
 
 
 
 
 
Current
$
775

 
$
(856
)
 
$
862

 
$
(879
)
Noncurrent
95

 
(88
)
 
154

 
(141
)
Total derivatives
$
870

 
$
(944
)
 
$
1,016

 
$
(1,020
)
Netting Offsets of Derivative Assets and Liabilities [Table Text Block]
The following table presents the netting offsets of derivative assets and liabilities at March 31, 2013 and December 31, 2012:
 
March 31, 2013
 
December 31, 2012
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Statements of Financial Position
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Statements of Financial Position
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
 
(In millions)
Derivative assets:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
539

 
$
(531
)
 
$
8

 
$
645

 
$
(605
)
 
$
40

Electricity
308

 
(247
)
 
61

 
360

 
(258
)
 
102

Other
23

 
(19
)
 
4

 
11

 
(6
)
 
5

Total derivative assets
$
870

 
$
(797
)
 
$
73

 
$
1,016

 
$
(869
)
 
$
147

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
(1
)
 
$
—

 
$
(1
)
 
$
(1
)
 
$
—

 
$
(1
)
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
(617
)
 
577

 
(40
)
 
(661
)
 
605

 
(56
)
Electricity
(307
)
 
254

 
(53
)
 
(351
)
 
258

 
(93
)
Other
(19
)
 
18

 
(1
)
 
(7
)
 
6

 
(1
)
Total derivative liabilities
$
(944
)
 
$
849

 
$
(95
)
 
$
(1,020
)
 
$
869

 
$
(151
)
Netting Offsets of Derivative Assets and Liabilities Reconciliation to the Statements of Financial Position [Table Text Block]
he following table presents the netting offsets of derivative assets and liabilities at March 31, 2013 and December 31, 2012:
 
March 31, 2013
 
December 31, 2012
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
(In millions)
Reconciliation of derivative instruments to Consolidated Statements of Financial Position:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total fair value of derivatives
$
775

 
$
95

 
$
(856
)
 
$
(88
)
 
$
862

 
$
154

 
$
(879
)
 
$
(141
)
Counterparty netting
(719
)
 
(74
)
 
719

 
74

 
(754
)
 
(115
)
 
754

 
115

Collateral adjustment
—

 
(4
)
 
56

 
—

 
—

 
—

 
—

 
—

Total derivatives as reported
$
56

 
$
17

 
$
(81
)
 
$
(14
)
 
$
108

 
$
39

 
$
(125
)
 
$
(26
)
Gain (Loss) Recognized in Income on Derivative
The effect of derivatives not designated as hedging instruments on the Consolidated Statements of Operations for the three months ended March 31, 2013 and 2012 is as follows:
 
 
Location of Gain
(Loss) Recognized
in Income on Derivatives
 
Gain (Loss)
Recognized in
Income on
Derivatives for
the Three Months Ended March 31,
Derivatives not Designated as Hedging Instruments
 
 
2013
 
2012
 
 
 
 
(In millions)
Commodity Contracts:
 
 
 
 
 
 
Natural Gas
 
Operating Revenue
 
$
(10
)
 
$
2

Natural Gas
 
Fuel, purchased power and gas
 
14

 
(10
)
Electricity
 
Operating Revenue
 
20

 
(2
)
Other
 
Operating Revenue
 
1

 
8

Total
 
 
 
$
25

 
$
(2
)
Volume of Commodity Contracts [Table Text Block]
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
636,667,880
Electricity (MWh)
 
52,296,934
Foreign Currency Exchange ($ CAD)
 
14,158,230