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NEW ACCOUNTING STANDARDS - NARRATIVE (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting priniciple |  | $ (1) |  |  |  |  | $ 107
Retained earnings | $ 10,104 | 10,147 |  |  |  |  |
Regulatory Liability, Noncurrent | 4,016 | 3,922 |  |  |  |  |
Accumulated other comprehensive income (loss) | (764) | (626) |  |  |  |  |
Accounting Standards Update 2016-01 and 2018-03 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting priniciple |  |  |  |  |  | $ 1 |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting priniciple |  |  |  |  |  | $ 3 |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting priniciple |  |  |  |  |  |  | 23
Cost of electric fuel and purchased power | 1,370 | 1,293 | [1] | $ 1,187 |  |  |
Retained earnings | 4,687 | 4,268 |  |  |  |  |
Regulatory Liability, Noncurrent | 2,404 | 2,225 |  |  |  |  |
Accumulated other comprehensive income (loss) | (10) | (8) |  |  |  |  |
Southern California Gas Company [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting priniciple |  |  |  |  |  |  | $ 15
Retained earnings | 3,390 | 3,040 |  |  |  |  |
Regulatory Liability, Noncurrent | 1,612 | 1,697 |  |  |  |  |
Accumulated other comprehensive income (loss) | (20) | $ (21) |  |  |  |  |
Scenario, Forecast [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 40 |  |
Regulatory Liability, Noncurrent |  |  |  |  | 2 |  |
Accumulated other comprehensive income (loss) |  |  |  |  | 42 |  |
Scenario, Forecast [Member] | San Diego Gas and Electric Company [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  | 2 |  |
Accumulated other comprehensive income (loss) |  |  |  |  | 2 |  |
Scenario, Forecast [Member] | Southern California Gas Company [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Retained earnings |  |  |  |  | 2 |  |
Regulatory Liability, Noncurrent |  |  |  |  | 2 |  |
Accumulated other comprehensive income (loss) |  |  |  |  | $ 4 |  |
Assets Held under Capital Leases [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cost of electric fuel and purchased power | $ 117 |  |  |  |  |  |
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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