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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - OTHER INCOME, NET (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Income [Line Items] |  |  |  |  |
Allowance for equity funds used during construction | $ 98 | $ 168 |  | $ 116 |
Investment (losses) gains | (6) | 56 |  | 23 |
Gains (losses) on interest rate and foreign exchange instruments, net | 7 | 47 |  | (32) |
Foreign currency transaction losses | (5) | (35) |  | (1) |
Non-service component of net periodic benefit (cost) credit | (37) | (21) |  | 6 |
Electrical infrastructure relocation income | 7 | 3 |  | 10 |
Interest on regulatory balancing accounts, net | 2 | 3 |  | 4 |
Sundry, net | 6 | 12 |  | 12 |
Total | 72 | 233 | [1] | 138 | [1]
San Diego Gas and Electric Company [Member] |  |  |  |  |
Other Income [Line Items] |  |  |  |  |
Allowance for equity funds used during construction | 61 | 63 |  | 46 |
Non-service component of net periodic benefit (cost) credit | (6) | 4 |  | 14 |
Interest on regulatory balancing accounts, net | 4 | 3 |  | 3 |
Sundry, net | (3) | 0 |  | 1 |
Total | 56 | 70 | [1] | 64 | [1]
Southern California Gas Company [Member] |  |  |  |  |
Other Income [Line Items] |  |  |  |  |
Allowance for equity funds used during construction | 36 | 44 |  | 40 |
Non-service component of net periodic benefit (cost) credit | (10) | (5) |  | 6 |
Interest on regulatory balancing accounts, net | (2) | 0 |  | 1 |
Sundry, net | (9) | (8) |  | (9) |
Total | 15 | 31 | [1] | $ 38 | [1]
Sempra Mexico [Member] | IMG [Member] |  |  |  |  |
Other Income [Line Items] |  |  |  |  |
Foreign currency transaction losses | $ (3) | $ (35) |  |  |
[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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