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GENERAL INFORMATION AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance | [1] | $ 17,138 |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | $ 15 | $ (1)
AOCI, ending balance |  | 17,346 |  |  |
Foreign currency translation adjustments [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (564) | $ (420) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | 0 | 0
OCI before reclassifications |  | 32 | 24 |  |
Amounts reclassified from AOCI |  | 0 | 0 |  |
Net OCI |  | 32 | 24 |  |
AOCI, ending balance |  | (532) | (396) |  |
Financial instruments [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (82) | (122) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (25) | (3)
OCI before reclassifications |  | (45) | 66 |  |
Amounts reclassified from AOCI |  | (1) | (8) |  |
Net OCI |  | (46) | 58 |  |
AOCI, ending balance |  | (153) | (67) |  |
Pension and other postretirement benefits [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (118) | (84) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (17) | 0
OCI before reclassifications |  | 1 | 0 |  |
Amounts reclassified from AOCI |  | 2 | 2 |  |
Net OCI |  | 3 | 2 |  |
AOCI, ending balance |  | (132) | (82) |  |
Total accumulated other comprehensive income (loss) [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (764) | (626) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (42) | $ (3)
OCI before reclassifications |  | (12) | 90 |  |
Amounts reclassified from AOCI |  | 1 | (6) |  |
Net OCI |  | (11) | 84 |  |
AOCI, ending balance |  | (817) | (545) |  |
San Diego Gas and Electric Company [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance | [1] | 6,015 |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | 0 |
AOCI, ending balance |  | 6,191 |  |  |
San Diego Gas and Electric Company [Member] | Pension and other postretirement benefits [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (10) | (8) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (2) |
AOCI, ending balance |  | (12) | (8) |  |
San Diego Gas and Electric Company [Member] | Total accumulated other comprehensive income (loss) [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (10) | (8) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (2) |
AOCI, ending balance |  | (12) | (8) |  |
Southern California Gas Company [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance | [1] | 4,258 |  |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (2) |
AOCI, ending balance |  | 4,520 |  |  |
Southern California Gas Company [Member] | Financial instruments [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (12) | (13) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (2) |
AOCI, ending balance |  | (14) | (13) |  |
Southern California Gas Company [Member] | Pension and other postretirement benefits [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (8) | (8) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | (2) |
AOCI, ending balance |  | (10) | (8) |  |
Southern California Gas Company [Member] | Total accumulated other comprehensive income (loss) [Member] |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
AOCI, beginning balance |  | (20) | (21) |  |
Cumulative-effect adjustment from change in accounting principle |  |  |  | $ (4) |
AOCI, ending balance |  | $ (24) | $ (21) |  |
[1] | Derived from audited financial statements.

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