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Derivative Instruments (Tables) - Southern California Edison
 6 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Fair Value of Derivative Asset Instruments
The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
 
 
June 30, 2018
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net
Assets
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
89

 
$
3

 
$
92

 
$
10

 
$
—

 
$
10

 
$
82

Gross amounts offset in the consolidated balance sheets
 
(4
)
 
—

 
(4
)
 
(4
)
 
—

 
(4
)
 
—

Cash collateral posted
 
—

 
—

 
—

 
(2
)
 
—

 
(2
)
 
2

Net amounts presented in the consolidated balance sheets
 
$
85

 
$
3

 
$
88

 
$
4

 
$
—

 
$
4

 
$
84


 
 
December 31, 2017
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net
Assets
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
106

 
$
5

 
$
111

 
$
3

 
$
—

 
$
3

 
$
108

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

 
(1
)
 
(1
)
 
—

 
(1
)
 
—

Cash collateral posted
 
—

 
—

 
—

 
(1
)
 
—

 
(1
)
 
1

Net amounts presented in the consolidated balance sheets
 
$
105

 
$
5

 
$
110

 
$
1

 
$
—

 
$
1

 
$
109
Fair Value of Derivative Liabilities Instruments
The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:
 
 
June 30, 2018
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net
Assets
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
89

 
$
3

 
$
92

 
$
10

 
$
—

 
$
10

 
$
82

Gross amounts offset in the consolidated balance sheets
 
(4
)
 
—

 
(4
)
 
(4
)
 
—

 
(4
)
 
—

Cash collateral posted
 
—

 
—

 
—

 
(2
)
 
—

 
(2
)
 
2

Net amounts presented in the consolidated balance sheets
 
$
85

 
$
3

 
$
88

 
$
4

 
$
—

 
$
4

 
$
84


 
 
December 31, 2017
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net
Assets
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
106

 
$
5

 
$
111

 
$
3

 
$
—

 
$
3

 
$
108

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

 
(1
)
 
(1
)
 
—

 
(1
)
 
—

Cash collateral posted
 
—

 
—

 
—

 
(1
)
 
—

 
(1
)
 
1

Net amounts presented in the consolidated balance sheets
 
$
105

 
$
5

 
$
110

 
$
1

 
$
—

 
$
1

 
$
109
Summarization of Economic Hedging Activities
The following table summarizes the components of SCE's economic hedging activity:
 
 
Three months ended June 30,
 
Six months ended June 30,
(in millions)
 
2018
 
2017
 
2018
 
2017
Realized losses
 
$
(8
)
 
$
(3
)
 
$
(20
)
 
$
(5
)
Unrealized (losses) gains
 
(12
)
 
6

 
(26
)
 
(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
 
June 30, 2018
 
December 31, 2017
Electricity options, swaps and forwards
 
GWh
 
2,015

 
475
Natural gas options, swaps and forwards
 
Bcf
 
141

 
143
Congestion revenue rights
 
GWh
 
48,673

 
78,765