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Derivative Instruments (Tables) - SCE
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Schedule of Derivative Liabilities 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, 2019
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net Asset
(in millions)
 
Short-Term
 
Long-Term1
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
94

 
$
8

 
$
102

 
$
14

 
$
2

 
$
16

 
$
86

Gross amounts offset in the consolidated balance sheets
 
(13
)
 
(2
)
 
(15
)
 
(13
)
 
(2
)
 
(15
)
 
—

Cash collateral posted2
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net amounts presented in the consolidated balance sheets
 
$
81

 
$
6

 
$
87

 
$
1

 
$
—

 
$
1

 
$
86

1 
Included in "Other long-term assets" in the consolidated balance sheets.
2 
At December 31, 2019, SCE posted $24 million of cash collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.
 
 
December 31, 2018
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net Asset
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
171

 
$
2

 
$
173

 
$
13

 
$
—

 
$
13

 
$
160

Gross amounts offset in the consolidated balance sheets
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Cash collateral posted
 
—

 
—

 
—

 
(7
)
 
—

 
(7
)
 
7

Net amounts presented in the consolidated balance sheets
 
$
171

 
$
2

 
$
173

 
$
6

 
$
—

 
$
6

 
$
167
Schedule of Derivative Assets 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, 2019
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net Asset
(in millions)
 
Short-Term
 
Long-Term1
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
94

 
$
8

 
$
102

 
$
14

 
$
2

 
$
16

 
$
86

Gross amounts offset in the consolidated balance sheets
 
(13
)
 
(2
)
 
(15
)
 
(13
)
 
(2
)
 
(15
)
 
—

Cash collateral posted2
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net amounts presented in the consolidated balance sheets
 
$
81

 
$
6

 
$
87

 
$
1

 
$
—

 
$
1

 
$
86

1 
Included in "Other long-term assets" in the consolidated balance sheets.
2 
At December 31, 2019, SCE posted $24 million of cash collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.
 
 
December 31, 2018
 
 
 
 
Derivative Assets
 
Derivative Liabilities
 
Net Asset
(in millions)
 
Short-Term
 
Long-Term
 
Subtotal
 
Short-Term
 
Long-Term
 
Subtotal
 
Commodity derivative contracts
 
 
 
 
 
 
 
 
 
 
 
 
Gross amounts recognized
 
$
171

 
$
2

 
$
173

 
$
13

 
$
—

 
$
13

 
$
160

Gross amounts offset in the consolidated balance sheets
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Cash collateral posted
 
—

 
—

 
—

 
(7
)
 
—

 
(7
)
 
7

Net amounts presented in the consolidated balance sheets
 
$
171

 
$
2

 
$
173

 
$
6

 
$
—

 
$
6

 
$
167
Components of Economic Hedging Activity
The following table summarizes the components of SCE's economic hedging activity:
 
 
Years ended December 31,
(in millions)
 
2019
 
2018
 
2017
Realized (losses) gains
 
$
(7
)
 
$
26

 
$
(14
)
Unrealized (losses) gains
 
(74
)
 
82

 
106
Notional Volumes of Derivative Instruments
The following table summarizes the notional volumes of derivatives used for SCE economic hedging activities:
 
 
Economic Hedges
 
Unit of
December 31,
Commodity
Measure
2019
 
2018
Electricity options, swaps and forwards
GWh
3,155
 
2,786
Natural gas options, swaps and forwards
Bcf
43
 
20
Congestion revenue rights
GWh
48,170
 
54,453