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GENERAL INFORMATION AND OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Pension benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 27 | $ 33
Interest cost | 35 | 35
Expected return on assets | (36) | (42)
Prior service cost (credit) | 3 | 3
Actuarial loss (gain) | 14 | 9
Settlement charges | 0 | 14
Net periodic benefit cost (credit) | 43 | 52
Regulatory adjustment | (36) | (45)
Total expense recognized | 7 | 7
Contributions by employer | 9 |
Expected contributions in current fiscal year | 234 |
Pension benefits [Member] | San Diego Gas and Electric Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 8 | 8
Interest cost | 9 | 9
Expected return on assets | (11) | (13)
Prior service cost (credit) | 1 | 0
Actuarial loss (gain) | 4 | 1
Settlement charges | 0 | 14
Net periodic benefit cost (credit) | 11 | 19
Regulatory adjustment | (11) | (19)
Total expense recognized | 0 | 0
Contributions by employer | 0 |
Expected contributions in current fiscal year | 40 |
Pension benefits [Member] | Southern California Gas Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 16 | 22
Interest cost | 23 | 23
Expected return on assets | (24) | (26)
Prior service cost (credit) | 2 | 2
Actuarial loss (gain) | 9 | 6
Net periodic benefit cost (credit) | 26 | 27
Regulatory adjustment | (25) | (26)
Total expense recognized | 1 | 1
Contributions by employer | 1 |
Expected contributions in current fiscal year | 118 |
Other postretirement benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 4 | 6
Interest cost | 9 | 9
Expected return on assets | (18) | (18)
Prior service cost (credit) | 0 | 0
Actuarial loss (gain) | (2) | (1)
Settlement charges | 0 | 0
Net periodic benefit cost (credit) | (7) | (4)
Regulatory adjustment | 7 | 4
Total expense recognized | 0 | 0
Contributions by employer | 2 |
Expected contributions in current fiscal year | 9 |
Other postretirement benefits [Member] | San Diego Gas and Electric Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 1 | 1
Interest cost | 2 | 2
Expected return on assets | (3) | (3)
Prior service cost (credit) | 1 | 1
Actuarial loss (gain) | (1) | (1)
Settlement charges | 0 | 0
Net periodic benefit cost (credit) | 0 | 0
Regulatory adjustment | 0 | 0
Total expense recognized | 0 | 0
Contributions by employer | 0 |
Expected contributions in current fiscal year | 0 |
Other postretirement benefits [Member] | Southern California Gas Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 3 | 4
Interest cost | 7 | 7
Expected return on assets | (14) | (14)
Prior service cost (credit) | (1) | (1)
Actuarial loss (gain) | (2) | 0
Net periodic benefit cost (credit) | (7) | (4)
Regulatory adjustment | 7 | 4
Total expense recognized | 0 | $ 0
Contributions by employer | 0 |
Expected contributions in current fiscal year | $ 1 |

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