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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue from contracts with customers |  |
Total operating revenues | $ 4,056 | $ 4,268
Electric |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 2,677 |
Regulatory balancing accounts | 274 |
Total operating revenues | 2,951 |
Electric | Residential |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 1,336 |
Electric | Commercial |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 1,073 |
Electric | Industrial |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 324 |
Electric | Agricultural |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 125 |
Electric | Public street and highway lighting |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 20 |
Electric | Other |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | (201) |
Natural gas |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 1,399 |
Regulatory balancing accounts | (294) |
Total operating revenues | 1,105 |
Natural gas | Residential |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 958 |
Natural gas | Commercial |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 196 |
Natural gas | Transportation service only |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | 297 |
Natural gas | Other |  |
Revenue from contracts with customers |  |
Total revenue from contracts with customers | $ (52) |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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