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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | $ 12,670 |  |  |
Amounts reclassified from AOCI(2) | 21 | $ 19 | $ 18 |
Cumulative-effect adjustment from change in accounting priniciple |  | (1) |  | $ 107
AOCI, ending balance | 17,138 | 12,670 |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Sale of noncontrolling interests, net of offering costs | 90 | 196 | 1,701 |
San Diego Gas and Electric Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | 5,598 |  |  |
Amounts reclassified from AOCI(2) | 4 | 1 | 1 |
Cumulative-effect adjustment from change in accounting priniciple |  |  |  | 23
AOCI, ending balance | 6,015 | 5,598 |  |
Southern California Gas Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | 3,907 |  |  |
Amounts reclassified from AOCI(2) | 2 | 1 | 1 |
Cumulative-effect adjustment from change in accounting priniciple |  |  |  | $ 15
AOCI, ending balance | 4,258 | 3,907 |  |
Foreign currency translation adjustments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (420) | (527) | (582) |
OCI before reclassifications | (144) | 107 | 42 |
Amounts reclassified from AOCI(2) | 0 | 0 | 13 |
Total other comprehensive income (loss) | (144) | 107 | 55 |
Cumulative-effect adjustment from change in accounting priniciple |  | 0 |  |
AOCI, ending balance | (564) | (420) | (527) |
Financial instruments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (122) | (125) | (137) |
OCI before reclassifications | 40 | (4) | (7) |
Amounts reclassified from AOCI(2) | 3 | 7 | 19 |
Total other comprehensive income (loss) | 43 | 3 | 12 |
Cumulative-effect adjustment from change in accounting priniciple |  | (3) |  |
AOCI, ending balance | (82) | (122) | (125) |
Financial instruments [Member] | Southern California Gas Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (13) | (13) | (14) |
OCI before reclassifications | 0 |  | 0 |
Amounts reclassified from AOCI(2) | 1 | 0 | 1 |
Total other comprehensive income (loss) | 1 | 0 | 1 |
AOCI, ending balance | (12) | (13) | (13) |
Pension and other postretirement benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (84) | (96) | (87) |
OCI before reclassifications | (52) | 0 | (15) |
Amounts reclassified from AOCI(2) | 18 | 12 | 6 |
Total other comprehensive income (loss) | (34) | 12 | (9) |
Cumulative-effect adjustment from change in accounting priniciple |  | 0 |  |
AOCI, ending balance | (118) | (84) | (96) |
Pension and other postretirement benefits [Member] | San Diego Gas and Electric Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (8) | (8) | (8) |
OCI before reclassifications | (6) | (1) | (1) |
Amounts reclassified from AOCI(2) | 4 | 1 | 1 |
Total other comprehensive income (loss) | (2) | 0 | 0 |
AOCI, ending balance | (10) | (8) | (8) |
Pension and other postretirement benefits [Member] | Southern California Gas Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (8) | (9) | (5) |
OCI before reclassifications | (1) |  | (4) |
Amounts reclassified from AOCI(2) | 1 | 1 | 0 |
Total other comprehensive income (loss) | 0 | 1 | (4) |
AOCI, ending balance | (8) | (8) | (9) |
Accumulated other comprehensive income (loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (626) | (748) | (806) |
OCI before reclassifications | (156) | 103 | 20 |
Amounts reclassified from AOCI(2) | 21 | 19 | 38 |
Total other comprehensive income (loss) | (135) | 122 | 58 |
Cumulative-effect adjustment from change in accounting priniciple |  | (3) |  |
AOCI, ending balance | (764) | (626) | (748) |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Sale of noncontrolling interests, net of offering costs |  |  | 20 |
Accumulated other comprehensive income (loss) [Member] | San Diego Gas and Electric Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (8) | (8) | (8) |
OCI before reclassifications | (6) | (1) | (1) |
Amounts reclassified from AOCI(2) | 4 | 1 | 1 |
Total other comprehensive income (loss) | (2) | 0 | 0 |
AOCI, ending balance | (10) | (8) | (8) |
Accumulated other comprehensive income (loss) [Member] | Southern California Gas Company [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI, beginning balance | (21) | (22) | (19) |
OCI before reclassifications | (1) |  | (4) |
Amounts reclassified from AOCI(2) | 2 | 1 | 1 |
Total other comprehensive income (loss) | 1 | 1 | (3) |
AOCI, ending balance | $ (20) | $ (21) | $ (22) |

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