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Financial and Other Derivative Instruments (Tables)
 12 Months Ended
Dec. 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 December 31, 2013 and 2012:
 
December 31, 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:
 
 
 
 
 
 
 
Foreign currency exchange contracts
$
—

 
$
(1
)
 
$
—

 
$
—

Commodity Contracts:
 
 
 
 
 

 
 

Natural Gas
396

 
(503
)
 
645

 
(661
)
Electricity
400

 
(398
)
 
360

 
(351
)
Other
37

 
(34
)
 
11

 
(7
)
Total derivatives not designated as hedging instruments:
$
833

 
$
(936
)
 
$
1,016

 
$
(1,019
)
Total derivatives:
 
 
 
 
 
 
 
Current
$
691

 
$
(773
)
 
$
862

 
$
(879
)
Noncurrent
142

 
(163
)
 
154

 
(141
)
Total derivatives
$
833

 
$
(936
)
 
$
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 December 31, 2013 and 2012:
 
December 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
$
396

 
$
(382
)
 
$
14

 
$
645

 
$
(605
)
 
$
40

Electricity
400

 
(291
)
 
109

 
360

 
(258
)
 
102

Other
37

 
(34
)
 
3

 
11

 
(6
)
 
5

Total derivative assets
$
833

 
$
(707
)
 
$
126

 
$
1,016

 
$
(869
)
 
$
147

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
(503
)
 
$
395

 
$
(108
)
 
$
(661
)
 
$
605

 
$
(56
)
Electricity
(398
)
 
269

 
(129
)
 
(351
)
 
258

 
(93
)
Other
(34
)
 
34

 
—

 
(7
)
 
6

 
(1
)
Other derivative liabilities
(1
)
 
—

 
(1
)
 
(1
)
 
—

 
(1
)
Total derivative liabilities
$
(936
)
 
$
698

 
$
(238
)
 
$
(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 December 31, 2013 and 2012:
 
December 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
$
691

 
$
142

 
$
(773
)
 
$
(163
)
 
$
862

 
$
154

 
$
(879
)
 
$
(141
)
Counterparty netting
(566
)
 
(115
)
 
566

 
115

 
(754
)
 
(115
)
 
754

 
115

Collateral adjustment
(26
)
 
—

 
12

 
5

 
—

 
—

 
—

 
—

Total derivatives as reported
$
99

 
$
27

 
$
(195
)
 
$
(43
)
 
$
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 years ended December 31, 2013 and 2012 is as follows:
 
 
Location of Gain
(Loss) Recognized
in Income on Derivatives
 
Gain (Loss)
Recognized in
Income on
Derivatives for
Years Ended
December 31
Derivatives not Designated as Hedging Instruments
 
 
2013
 
2012
 
 
 
 
(In millions)
Foreign currency exchange contracts
 
Operating Revenue
 
$
(1
)
 
$
—

Commodity Contracts:
 
 
 
 
 
 
Natural Gas
 
Operating Revenue
 
(48
)
 
(29
)
Natural Gas
 
Fuel, purchased power and gas
 
(44
)
 
25

Electricity
 
Operating Revenue
 
82

 
64

Other
 
Operating Revenue
 
—

 
5

Total
 
 
 
$
(11
)
 
$
65
Volume of Commodity Contracts [Table Text Block]
The following represents the cumulative gross volume of derivative contracts outstanding as of December 31, 2013:
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
795,553,773
Electricity (MWh)
 
55,658,483
Foreign Currency Exchange ($ CAD)
 
65,074,206
FTR (MWh)
 
10,485,618