v3.6.0.2

NEW ACCOUNTING STANDARDS (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | $ 107 |  |  |  |  |  | $ 107 |
Excess Tax Benefits |  |  |  |  |  |  |  |  |  | $ (34) | $ 0 | $ 0
Weighted-average number of shares outstanding, diluted | 251,600 | 252,400 | 252,000 | 251,500 | 251,500 | 251,000 | 251,500 | 251,200 |  | 251,155 | 250,923 | 250,655
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares outstanding, diluted |  |  |  |  |  |  |  |  |  | 251,155 | 250,923 | 250,655
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | $ 23 |  |  |  |  |  | $ 23 |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 15 |  |  |  |  |  | 15 |
Retained earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 107 |  |  |  |  |  | 107 |
Retained earnings [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 23 |  |  |  |  |  | 23 |
Retained earnings [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 15 |  |  |  |  |  | 15 |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Excess Tax Benefits |  |  |  |  |  |  |  |  |  | $ 34 |  |
Weighted-average number of shares outstanding, diluted |  |  | 98 | 75 |  |  |  |  | 89 |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Excess Tax Benefits |  |  |  |  |  |  |  |  |  | 17 | 34 |
Weighted-average number of shares outstanding, diluted |  |  | 98 | 75 |  |  |  |  | 89 |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Excess Tax Benefits |  |  |  |  |  |  |  |  |  | 7 |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Excess Tax Benefits |  |  |  |  |  |  |  |  |  | $ 4 |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Retained earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 107 |  |  |  |  |  | 107 |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Retained earnings [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 49 |  |  |  |  |  | 49 |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Retained earnings [Member] | San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | 23 |  |  |  |  |  | 23 |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Retained earnings [Member] | Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  |  | $ 15 |  |  |  |  |  | $ 15 |

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