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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | $ 8,586 | $ 8,679
Cost of removal obligations |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 5,674 | 5,547
Deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 873 | 1,021
Recoveries in excess of AROs |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 533 | 624
Public purpose programs |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 591 | 590
Other |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | $ 915 | $ 897

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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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