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Derivative Instruments (Balance Sheet Disclosures) (Details) - SCE - Commodity derivative contracts - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Electric Utility |  |
Derivative Assets |  |
Gross amounts recognized | $ 75 | $ 165
Gross amounts offset in consolidated balance sheets | (1) | (2)
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 74 | 163
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 1,158 | 1,335
Gross amounts offset in consolidated balance sheets | (1) | (2)
Cash collateral posted | 0 | (15)
Net amounts presented in the consolidated balance sheets | 1,157 | 1,318
Net Liability |  |
Gross amounts recognized | 1,083 | 1,170
Gross amounts offset in consolidated balance sheets | 0 | 0
Cash collateral posted | 0 | (15)
Net amounts presented in the consolidated balance sheets | 1,083 | 1,155
Derivative Assets, Short-Term | Electric Utility |  |
Derivative Assets |  |
Gross amounts recognized | 74 | 81
Gross amounts offset in consolidated balance sheets | (1) | (2)
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 73 | 79
Derivative Assets, Long-Term | Electric Utility |  |
Derivative Assets |  |
Gross amounts recognized | 1 | 84
Gross amounts offset in consolidated balance sheets | 0 | 0
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 1 | 84
Derivative Liability, Short-Term | Electric Utility |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 217 | 235
Gross amounts offset in consolidated balance sheets | (1) | (2)
Cash collateral posted | 0 | (15)
Net amounts presented in the consolidated balance sheets | 216 | 218
Derivative Liability, Long-Term | Electric Utility |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 941 | 1,100
Gross amounts offset in consolidated balance sheets | 0 | 0
Cash collateral posted | 0 | 0
Net amounts presented in the consolidated balance sheets | 941 | 1,100
Other Current Liabilities |  |
Net Liability |  |
Cash collateral | $ 2 |
Other Current Assets |  |
Net Liability |  |
Cash collateral |  | $ 31

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