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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | $ 3,724 | $ 3,793
Pension benefits |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 1,915 | 1,954
Environmental compliance costs |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 749 | 837
Utility retained generation |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 308 | 319
Price risk management |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 68 | 65
Unamortized loss, net of gain, on reacquired debt |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 88 | 79
Catastrophic event memorandum account |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | 314 | 274
Other |  |
Regulatory Assets [Line Items] |  |
Total long-term regulatory assets | $ 282 | $ 265

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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://www.xbrl.org/2003/role/presentationRef -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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