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Financial and Other Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair value of derivative instruments
The following tables present the fair value of derivative instruments as of June 30, 2014 and December 31, 2013:

 
June 30, 2014
 
December 31, 2013
 
Derivative
Assets
 
Derivative Liabilities
 
Derivative
Assets
 
Derivative Liabilities
 
(In millions)
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Foreign currency exchange contracts
$
—

 
$
(1
)
 
$
—

 
$
(1
)
Commodity Contracts:
 
 
 
 
 

 
 

Natural Gas
271

 
(318
)
 
396

 
(503
)
Electricity
593

 
(606
)
 
400

 
(398
)
Other
45

 
(39
)
 
37

 
(34
)
Total derivatives not designated as hedging instruments:
$
909

 
$
(964
)
 
$
833

 
$
(936
)
Total derivatives:
 
 
 
 
 
 
 
Current
$
778

 
$
(830
)
 
$
691

 
$
(773
)
Noncurrent
131

 
(134
)
 
142

 
(163
)
Total derivatives
$
909

 
$
(964
)
 
$
833

 
$
(936
)
Netting Offsets of Derivative Assets and Liabilities [Table Text Block]
The following table presents the netting offsets of derivative assets and liabilities at June 30, 2014 and December 31, 2013:

 
June 30, 2014
 
December 31, 2013
 
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
$
271

 
$
(259
)
 
$
12

 
$
396

 
$
(382
)
 
$
14

Electricity
593

 
(487
)
 
106

 
400

 
(291
)
 
109

Other
45

 
(39
)
 
6

 
37

 
(34
)
 
3

Total derivative assets
$
909

 
$
(785
)
 
$
124

 
$
833

 
$
(707
)
 
$
126

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
(318
)
 
$
264

 
$
(54
)
 
$
(503
)
 
$
395

 
$
(108
)
Electricity
(606
)
 
484

 
(122
)
 
(398
)
 
269

 
(129
)
Other
(39
)
 
39

 
—

 
(34
)
 
34

 
—

Other derivative liabilities
(1
)
 
—

 
(1
)
 
(1
)
 
—

 
(1
)
Total derivative liabilities
$
(964
)
 
$
787

 
$
(177
)
 
$
(936
)
 
$
698

 
$
(238
)
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 June 30, 2014 and December 31, 2013:

 
June 30, 2014
 
December 31, 2013
 
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
$
778

 
$
131

 
$
(830
)
 
$
(134
)
 
$
691

 
$
142

 
$
(773
)
 
$
(163
)
Counterparty netting
(675
)
 
(105
)
 
675

 
105

 
(566
)
 
(115
)
 
566

 
115

Collateral adjustment
(5
)
 
—

 
7

 
—

 
(26
)
 
—

 
12

 
5

Total derivatives as reported
$
98

 
$
26

 
$
(148
)
 
$
(29
)
 
$
99

 
$
27

 
$
(195
)
 
$
(43
)
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 six months ended June 30, 2014 and 2013 is as follows:
 
 
Location of Gain
(Loss) Recognized
in Income on Derivatives
 
Gain (Loss)
Recognized in
Income on
Derivatives for
the Three Months Ended June 30,
 
Gain (Loss)
Recognized in
Income on
Derivatives for
the Six Months Ended June 30,
Derivatives not Designated as Hedging Instruments
 
 
2014
 
2013
 
2014
 
2013
 
 
 
 
(In millions)
Foreign currency exchange contracts
 
Operating Revenue
 
$
3

 
$
(1
)
 
$
(1
)
 
$
(1
)
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
Natural Gas
 
Operating Revenue
 
155

 
46

 
28

 
36

Natural Gas
 
Fuel, purchased power and gas
 
(9
)
 
(46
)
 
11

 
(32
)
Electricity
 
Operating Revenue
 
(45
)
 
10

 
88

 
30

Other
 
Operating Revenue
 
(3
)
 
(1
)
 
(4
)
 
—

Total
 
 
 
$
101

 
$
8

 
$
122

 
$
33
Volume of Commodity Contracts [Table Text Block]
The following represents the cumulative gross volume of derivative contracts outstanding as of June 30, 2014:
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
815,660,484
Electricity (MWh)
 
19,527,918
Oil (Gallons)
 
11,592,000
Foreign Currency Exchange ($ CAD)
 
79,076,508