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Derivative Instruments (Balance Sheet Disclosures) (Details) - Southern California Edison Company - Commodity derivative contracts - Electric Utility - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative Assets |  |
Gross amounts recognized | $ 92 | $ 111
Gross amounts offset in the consolidated balance sheets | (4) | (1)
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 88 | 110
Derivative Liabilities |  |
Gross amounts recognized | 10 | 3
Gross amounts offset in the consolidated balance sheets | (4) | (1)
Cash collateral posted | (2) | (1)
Net amounts presented in the consolidated balance sheets | 4 | 1
Net Assets |  |
Gross amounts recognized | 82 | 108
Gross amounts offset in the consolidated balance sheets | 0 | 0
Cash collateral posted | 2 | 1
Net amounts presented in the consolidated balance sheets | 84 | 109
Derivative Assets, Short-Term |  |
Derivative Assets |  |
Gross amounts recognized | 89 | 106
Gross amounts offset in the consolidated balance sheets | (4) | (1)
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 85 | 105
Derivative Assets, Long-Term |  |
Derivative Assets |  |
Gross amounts recognized | 3 | 5
Gross amounts offset in the consolidated balance sheets | 0 | 0
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 3 | 5
Derivative Liability, Short-Term |  |
Derivative Liabilities |  |
Gross amounts recognized | 10 | 3
Gross amounts offset in the consolidated balance sheets | (4) | (1)
Cash collateral posted | (2) | (1)
Net amounts presented in the consolidated balance sheets | 4 | 1
Derivative Liability, Long-Term |  |
Derivative Liabilities |  |
Gross amounts recognized | 0 | 0
Gross amounts offset in the consolidated balance sheets | 0 | 0
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | $ 0 | $ 0

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