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Financial and Other Derivative Instruments (Tables)
 9 Months Ended
Sep. 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 September 30, 2014 and December 31, 2013:
 
September 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

 
$
(3
)
 
$
—

 
$
(1
)
Commodity Contracts:
 
 
 
 
 

 
 

Natural Gas
254

 
(342
)
 
396

 
(503
)
Electricity
386

 
(394
)
 
400

 
(398
)
Other
52

 
(48
)
 
37

 
(34
)
Total derivatives not designated as hedging instruments:
$
693

 
$
(787
)
 
$
833

 
$
(936
)
Total derivatives:
 
 
 
 
 
 
 
Current
$
605

 
$
(696
)
 
$
691

 
$
(773
)
Noncurrent
88

 
(91
)
 
142

 
(163
)
Total derivatives
$
693

 
$
(787
)
 
$
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 September 30, 2014 and December 31, 2013:
 
September 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
$
254

 
$
(225
)
 
$
29

 
$
396

 
$
(382
)
 
$
14

Electricity
386

 
(322
)
 
64

 
400

 
(291
)
 
109

Other
52

 
(48
)
 
4

 
37

 
(34
)
 
3

Other derivative contracts (a)
1

 
(1
)
 
—

 
—

 
—

 
—

Total derivative assets
$
693

 
$
(596
)
 
$
97

 
$
833

 
$
(707
)
 
$
126

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
(342
)
 
$
268

 
$
(74
)
 
$
(503
)
 
$
395

 
$
(108
)
Electricity
(394
)
 
317

 
(77
)
 
(398
)
 
269

 
(129
)
Other
(48
)
 
48

 
—

 
(34
)
 
34

 
—

Other derivative contracts (a)
(3
)
 
1

 
(2
)
 
(1
)
 
—

 
(1
)
Total derivative liabilities
$
(787
)
 
$
634

 
$
(153
)
 
$
(936
)
 
$
698

 
$
(238
)

_______________________________________
(a)
Primarily includes Foreign currency exchange contracts.
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, 2014 and December 31, 2013:
 
September 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
$
605

 
$
88

 
$
(696
)
 
$
(91
)
 
$
691

 
$
142

 
$
(773
)
 
$
(163
)
Counterparty netting
(533
)
 
(59
)
 
533

 
59

 
(566
)
 
(115
)
 
566

 
115

Collateral adjustment
(4
)
 
—

 
29

 
13

 
(26
)
 
—

 
12

 
5

Total derivatives as reported
$
68

 
$
29

 
$
(134
)
 
$
(19
)
 
$
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 nine months ended September 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 September 30,
 
Gain (Loss)
Recognized in
Income on
Derivatives for
the Nine Months Ended September 30,
Derivatives not Designated as Hedging Instruments
 
 
2014
 
2013
 
2014
 
2013
 
 
 
 
(In millions)
Foreign currency exchange contracts
 
Operating Revenue
 
$
(1
)
 
$
—

 
$
(2
)
 
$
(1
)
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
Natural Gas
 
Operating Revenue
 
(38
)
 
1

 
(10
)
 
37

Natural Gas
 
Fuel, purchased power and gas
 
12

 
(1
)
 
23

 
(33
)
Electricity
 
Operating Revenue
 
12

 
22

 
100

 
52

Other
 
Operating Revenue
 
(1
)
 
1

 
(5
)
 
1

Total
 
 
 
$
(16
)
 
$
23

 
$
106

 
$
56
Volume of Commodity Contracts [Table Text Block]
The following represents the cumulative gross volume of derivative contracts outstanding as of September 30, 2014:
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
865,462,971
Electricity (MWh)
 
15,291,188
Oil (Gallons)
 
10,290,000
Foreign Currency Exchange (Canadian dollars)
 
81,310,582