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Derivative Instruments (Tables) - Southern California Edison
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
 
 
December 31, 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
 
$
81

 
$
84

 
$
165

 
$
235

 
$
1,100

 
$
1,335

 
$
1,170

Gross amounts offset in consolidated balance sheets
 
(2
)
 
—

 
(2
)
 
(2
)
 
—

 
(2
)
 
—

Cash collateral posted1
 
—

 
—

 
—

 
(15
)
 
—

 
(15
)
 
(15
)
Net amounts presented in the consolidated balance sheets
 
$
79

 
$
84

 
$
163

 
$
218

 
$
1,100

 
$
1,318

 
$
1,155


 
 
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 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 December 31, 2015 and 2014, SCE had posted $31 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.
Derivative Instruments, Gain (Loss)
The following table summarizes the components of SCE's economic hedging activity:
 
 
Years ended December 31,
(in millions)
 
2015
 
2014
 
2013
Realized losses
 
$
(148
)
 
$
(57
)
 
$
(56
)
Unrealized (losses) gains
 
(182
)
 
(147
)
 
93
Notional Volumes of Derivative Instruments
The following table summarizes the notional volumes of derivatives used for SCE hedging activities:
 
 
Economic Hedges
 
Unit of
December 31,
Commodity
Measure
2015
 
2014
Electricity options, swaps and forwards
GWh
6,221

 
3,618
Natural gas options, swaps and forwards
Bcf
32

 
83
Congestion revenue rights
GWh
109,740

 
122,859
Tolling arrangements
GWh
70,663

 
79,989