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INCOME TAXES - DEFERRED INCOME TAXES (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Less: valuation allowances | $ 164 | $ 133
Deferred income taxes, noncurrent | 151 | 170
Deferred income taxes | 2,571 | 2,767
Sempra Energy Consolidated [Member] |  |
Deferred Tax Liabilities, Gross [Abstract] |  |
Differences in financial and tax bases of fixed assets, investments and other assets | 3,780 | 4,233
U.S. state and non-U.S. withholding tax on repatriation of foreign earnings | 382 | 360
Regulatory balancing accounts | 359 | 376
Property taxes | 41 | 37
Other deferred income tax liabilities | 130 | 117
Total deferred income tax liabilities | 4,692 | 5,123
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits | 1,114 | 1,066
Net operating losses | 725 | 968
Compensation-related items | 181 | 199
Postretirement benefits | 255 | 251
Other deferred income tax assets | 92 | 115
Accrued expenses not yet deductible | 69 | 60
Deferred income tax assets before valuation allowances | 2,436 | 2,659
Less: valuation allowances | 164 | 133
Total deferred income tax assets | 2,272 | 2,526
Net deferred income tax liability | 2,420 | 2,597
Deferred income taxes, noncurrent | 151 | 170
Deferred income taxes | 2,571 | 2,767
San Diego Gas and Electric Company [Member] |  |
Deferred Tax Liabilities, Gross [Abstract] |  |
Differences in financial and tax bases of fixed assets, investments and other assets | 1,578 | 1,472
Regulatory balancing accounts | 84 | 113
Property taxes | 29 | 26
Other deferred income tax liabilities | 10 | 10
Total deferred income tax liabilities | 1,701 | 1,621
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits | 6 | 7
Net operating losses | 0 | 0
Compensation-related items | 5 | 5
Postretirement benefits | 58 | 43
Other deferred income tax assets | 6 | 19
State income taxes | 6 | 14
Accrued expenses not yet deductible | 4 | 3
Total deferred income tax assets | 85 | 91
Net deferred income tax liability | 1,616 | 1,530
Deferred income taxes | 1,616 | 1,530
Southern California Gas Company [Member] |  |
Deferred Tax Liabilities, Gross [Abstract] |  |
Differences in financial and tax bases of fixed assets, investments and other assets | 1,077 | 987
Regulatory balancing accounts | 283 | 271
Property taxes | 13 | 12
Other deferred income tax liabilities | 2 | 1
Total deferred income tax liabilities | 1,375 | 1,271
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits | 3 | 15
Net operating losses | 0 | 58
Compensation-related items | 25 | 25
Postretirement benefits | 140 | 152
Other deferred income tax assets | 14 | 7
State income taxes | 3 | 7
Accrued expenses not yet deductible | 13 | 12
Total deferred income tax assets | 198 | 276
Net deferred income tax liability | 1,177 | 995
Deferred income taxes | $ 1,177 | $ 995

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