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GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER INCOME (EXPENSE), NET (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Other Income [Line Items] |  |  |
Allowance for equity funds used during construction |  | $ 21 | $ 27
Investment gains (losses) |  | 26 | (1)
Gains on interest rate and foreign exchange instruments, net |  | 13 | 62
Foreign currency transaction gains, net |  | 7 | 30
Non-service component of net periodic benefit credit |  | 24 | 32
Penalties related to billing practices OII |  | (8) | 0
Interest on regulatory balancing accounts, net |  | (1) | 0
Sundry, net |  | 0 | 2
Total |  | 82 | 152
San Diego Gas and Electric Company [Member] |  |  |
Other Income [Line Items] |  |  |
Allowance for equity funds used during construction |  | 12 | 18
Non-service component of net periodic benefit credit |  | 9 | 9
Sundry, net |  | 1 | 1
Total |  | 22 | 28
Southern California Gas Company [Member] |  |  |
Other Income [Line Items] |  |  |
Allowance for equity funds used during construction |  | 8 | 9
Non-service component of net periodic benefit credit |  | 18 | 25
Penalties related to billing practices OII | $ (8) | (8) | 0
Interest on regulatory balancing accounts, net |  | (1) | 0
Sundry, net |  | (1) | (1)
Total |  | 16 | 33
Sempra Mexico [Member] | IMG [Member] |  |  |
Other Income [Line Items] |  |  |
Foreign currency gain |  | $ 10 | $ 39

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