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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | $ 5,349 | $ 4,964
Retained generation asset costs | 1,200 |
Pension benefits |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 1,928 | 1,947
Environmental compliance costs |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 997 | 1,013
Utility retained generation |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 251 | 274
Price risk management |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 67 | 90
Unamortized loss, net of gain, on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 230 | 76
Catastrophic event memorandum account |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 918 | 790
Wildfire expense memorandum account |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 127 | 94
Fire hazard prevention memorandum account |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 291 | 263
Fire risk mitigation memorandum account |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 154 | 0
Other |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | $ 386 | $ 417

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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