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Derivative Instruments (Tables) - Southern California Edison
 9 Months Ended
Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Fair Value of Derivative Instruments
The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
 
 
September 30, 2015
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net
Liability
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
82

 
$
188

 
$
270

 
$
243

 
$
1,166

 
$
1,409

 
$
1,139

Gross amounts offset in the consolidated balance sheets
 
(1
)
 
—

 
(1
)
 
(1
)
 
—

 
(1
)
 
—

Cash collateral posted1
 
—

 
—

 
—

 
(35
)
 
—

 
(35
)
 
(35
)
Net amounts presented in the consolidated balance sheets
 
$
81

 
$
188

 
$
269

 
$
207

 
$
1,166

 
$
1,373

 
$
1,104


 
 
December 31, 2014
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net
Liability
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
104

 
$
219

 
$
323

 
$
259

 
$
1,052

 
$
1,311

 
$
988

Gross amounts offset in the consolidated balance sheets
 
(2
)
 
—

 
(2
)
 
(2
)
 
—

 
(2
)
 
—

Cash collateral posted1
 
—

 
—

 
—

 
(61
)
 
—

 
(61
)
 
(61
)
Net amounts presented in the consolidated balance sheets
 
$
102

 
$
219

 
$
321

 
$
196

 
$
1,052

 
$
1,248

 
$
927


1 
In addition, at September 30, 2015 and December 31, 2014, SCE had posted $32 million and $36 million, respectively, of collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.
Summarization of Economic Hedging Activities
The following table summarizes the components of SCE's economic hedging activity:
 
 
Three months ended September 30,
 
Nine months ended September 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Realized losses
 
$
(28
)

$
(18
)
 
$
(103
)
 
$
(59
)
Unrealized (losses) gains
 
(67
)

138

 
(152
)
 
80
Notional Volumes of Derivative Instruments
The following table summarizes the notional volumes of derivatives used for SCE hedging activities:
 
 
 
 
Economic Hedges
Commodity
 
Unit of Measure
 
September 30, 2015
 
December 31, 2014
Electricity options, swaps and forwards
 
GWh
 
4,807

 
3,618
Natural gas options, swaps and forwards
 
Bcf
 
64

 
83
Congestion revenue rights
 
GWh
 
103,207

 
122,859
Tolling arrangements
 
GWh
 
73,008

 
79,989