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Financial and Other Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2013 and December 31, 2012:
 
September 30, 2013
 
December 31, 2012
 
Derivative
Assets
 
Derivative Liabilities
 
Derivative
Assets
 
Derivative Liabilities
 
(In millions)
Derivatives designated as hedging instruments:
 
 
 
 
 
 
 
Interest rate contracts
$
—

 
$
—

 
$
—

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

 
 

Natural Gas
$
483

 
$
(471
)
 
$
645

 
$
(661
)
Electricity
298

 
(287
)
 
360

 
(351
)
Other
62

 
(57
)
 
11

 
(7
)
Total derivatives not designated as hedging instruments:
$
843

 
$
(815
)
 
$
1,016

 
$
(1,019
)
Total derivatives:
 
 
 
 
 
 
 
Current
$
711

 
$
(668
)
 
$
862

 
$
(879
)
Noncurrent
132

 
(147
)
 
154

 
(141
)
Total derivatives
$
843

 
$
(815
)
 
$
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 September 30, 2013 and December 31, 2012:
 
September 30, 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
$
483

 
$
(474
)
 
$
9

 
$
645

 
$
(605
)
 
$
40

Electricity
298

 
(216
)
 
82

 
360

 
(258
)
 
102

Other
62

 
(55
)
 
7

 
11

 
(6
)
 
5

Total derivative assets
$
843

 
$
(745
)
 
$
98

 
$
1,016

 
$
(869
)
 
$
147

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
$
—

 
$
—

 
$
—

 
$
(1
)
 
$
—

 
$
(1
)
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
(471
)
 
445

 
(26
)
 
(661
)
 
605

 
(56
)
Electricity
(287
)
 
236

 
(51
)
 
(351
)
 
258

 
(93
)
Other
(57
)
 
55

 
(2
)
 
(7
)
 
6

 
(1
)
Total derivative liabilities
$
(815
)
 
$
736

 
$
(79
)
 
$
(1,020
)
 
$
869

 
$
(151
)
Netting Offsets of Derivative Assets and Liabilities Reconciliation to the Statements of Financial Position [Table Text Block]
The following table presents the netting offsets of derivative assets and liabilities at September 30, 2013 and December 31, 2012:
 
September 30, 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
$
711

 
$
132

 
$
(668
)
 
$
(147
)
 
$
862

 
$
154

 
$
(879
)
 
$
(141
)
Counterparty netting
(610
)
 
(106
)
 
610

 
106

 
(754
)
 
(115
)
 
754

 
115

Collateral adjustment
(29
)
 
—

 
—

 
20

 
—

 
—

 
—

 
—

Total derivatives as reported
$
72

 
$
26

 
$
(58
)
 
$
(21
)
 
$
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 and nine months ended September 30, 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 September 30,
 
Gain (Loss)
Recognized in
Income on
Derivatives for
the Nine Months Ended September 30,
Derivatives not Designated as Hedging Instruments
 
 
2013
 
2012
 
2013
 
2012
 
 
 
 
(In millions)
Foreign currency exchange contracts
 
Operating Revenue
 
$
—

 
$
(2
)
 
$
(1
)
 
$
(1
)
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
Natural Gas
 
Operating Revenue
 
1

 
(54
)
 
37

 
(51
)
Natural Gas
 
Fuel, purchased power and gas
 
(1
)
 
50

 
(33
)
 
45

Electricity
 
Operating Revenue
 
22

 
17

 
52

 
52

Other
 
Operating Revenue
 
1

 
1

 
1

 
12

Total
 
 
 
$
23

 
$
12

 
$
56

 
$
57
Volume of Commodity Contracts [Table Text Block]
The following represents the cumulative gross volume of derivative contracts outstanding as of September 30, 2013:
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
683,113,433
Electricity (MWh)
 
59,672,654
Foreign Currency Exchange ($ CAD)
 
48,741,288
FTR (MWh)
 
13,005,024