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NEW ACCOUNTING STANDARDS - INCOME STATEMENT IMPACT (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and maintenance |  |  |  |  |  |  |  |  | $ 3,309 | $ 3,096 | [1] | $ 2,976 | [1]
Other income, net |  |  |  |  |  |  |  |  | 72 | 233 | [1] | 138 | [1]
Accounting Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and maintenance |  |  |  |  |  |  |  |  |  | 3,096 |  | 2,976 |
Other income, net |  |  |  |  |  |  |  |  |  | 233 |  | 138 |
Accounting Standards Update 2017-07 [Member] | As previously reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and maintenance |  |  |  |  |  |  |  |  |  | 3,117 |  | 2,970 |
Other income, net |  |  |  |  |  |  |  |  |  | 254 |  | 132 |
Accounting Standards Update 2017-07 [Member] | Effect of adoption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operation and maintenance |  |  |  |  |  |  |  |  |  | (21) |  | 6 |
Other income, net |  |  |  |  |  |  |  |  |  | (21) |  | 6 |
San Diego Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  | 1,058 | 1,024 | [1] | 1,062 | [1]
Operating income | $ 247 | $ 300 | $ 215 | $ 248 | $ 256 | $ (58) | $ 237 | $ 274 | 1,010 | 709 | [1] | 976 | [1]
Other income, net |  |  |  |  |  |  |  |  | 56 | 70 | [1] | 64 | [1]
San Diego Gas and Electric Company [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  |  | 1,024 |  | 1,062 |
Operating expenses |  |  |  |  |  |  |  |  |  | 3,767 |  | 3,277 |
Operating income |  |  |  |  |  |  |  |  |  | 709 |  | 976 |
Other income, net |  |  |  |  |  |  |  |  |  | 70 |  | 64 |
San Diego Gas and Electric Company [Member] | Accounting Standards Update 2017-07 [Member] | As previously reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  |  | 1,020 |  | 1,048 |
Operating expenses |  |  |  |  |  |  |  |  |  | 3,763 |  | 3,263 |
Operating income |  |  |  |  |  |  |  |  |  | 713 |  | 990 |
Other income, net |  |  |  |  |  |  |  |  |  | 66 |  | 50 |
San Diego Gas and Electric Company [Member] | Accounting Standards Update 2017-07 [Member] | Effect of adoption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  |  | 4 |  | 14 |
Operating expenses |  |  |  |  |  |  |  |  |  | 4 |  | 14 |
Operating income |  |  |  |  |  |  |  |  |  | (4) |  | (14) |
Other income, net |  |  |  |  |  |  |  |  |  | 4 |  | 14 |
Southern California Gas Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  | 1,613 | 1,474 | [1] | 1,391 | [1]
Operating income | $ 239 | $ 5 | $ 69 | $ 278 | $ 230 | $ 5 | $ 80 | $ 312 | 591 | 627 | [1] | 551 | [1]
Other income, net |  |  |  |  |  |  |  |  | $ 15 | 31 | [1] | 38 | [1]
Southern California Gas Company [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  |  | 1,474 |  | 1,391 |
Operating expenses |  |  |  |  |  |  |  |  |  | 3,158 |  | 2,920 |
Operating income |  |  |  |  |  |  |  |  |  | 627 |  | 551 |
Other income, net |  |  |  |  |  |  |  |  |  | 31 |  | 38 |
Southern California Gas Company [Member] | Accounting Standards Update 2017-07 [Member] | As previously reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  |  | 1,479 |  | 1,385 |
Operating expenses |  |  |  |  |  |  |  |  |  | 3,163 |  | 2,914 |
Operating income |  |  |  |  |  |  |  |  |  | 622 |  | 557 |
Other income, net |  |  |  |  |  |  |  |  |  | 36 |  | 32 |
Southern California Gas Company [Member] | Accounting Standards Update 2017-07 [Member] | Effect of adoption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities Operation and maintenance |  |  |  |  |  |  |  |  |  | (5) |  | 6 |
Operating expenses |  |  |  |  |  |  |  |  |  | (5) |  | 6 |
Operating income |  |  |  |  |  |  |  |  |  | 5 |  | (6) |
Other income, net |  |  |  |  |  |  |  |  |  | $ (5) |  | $ 6 |
[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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