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INCOME TAXES - RECONCILIATION TO EFFECTIVE TAX RATE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Line Items] |  |  |  |  |
Income tax expense | $ 96 | $ 1,276 | [1] | $ 389 | [1]
Income before income taxes and equity earnings of unconsolidated entities | 1,046 | 1,551 | [1] | 1,824 | [1]
Equity earnings, before income tax | (236) | 34 |  | 6 |
Pretax income | $ 810 | $ 1,585 |  | $ 1,830 |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |
U.S. federal statutory income tax rate | 21.00% | 35.00% |  | 35.00% |
Effects of the TCJA | 11.00% | 55.00% |  | 0.00% |
Non-U.S. earnings taxed at lower statutory income tax rates | 9.00% | (3.00%) |  | (3.00%) |
Depreciation | 7.00% | 6.00% |  | 4.00% |
Foreign exchange and inflation effects | 4.00% | 3.00% |  | (2.00%) |
Compensation-related items | 3.00% | 0.00% |  | (2.00%) |
Unrecognized income tax benefits | 2.00% | 0.00% |  | 0.00% |
Noncontrolling interests in tax equity arrangements | 2.00% | 0.00% |  | 0.00% |
Resolution of prior years’ income tax items | 0.00% | (2.00%) |  | 0.00% |
Impairment losses at Sempra LNG & Midstream | (19.00%) | 0.00% |  | 0.00% |
Repairs expenditures | (8.00%) | (6.00%) |  | (4.00%) |
Tax credits | (6.00%) | (4.00%) |  | (3.00%) |
State income taxes, net of federal income tax benefit | (5.00%) | 1.00% |  | 1.00% |
Self-developed software expenditures | (4.00%) | (4.00%) |  | (3.00%) |
Allowance for equity funds used during construction | (3.00%) | (3.00%) |  | (2.00%) |
Amortization of excess deferred income taxes | (2.00%) | 0.00% |  | 0.00% |
Merger-related transaction costs | (1.00%) | 0.00% |  | 0.00% |
Other, net | 1.00% | 3.00% |  | 0.00% |
Effective income tax rate | 12.00% | 81.00% |  | 21.00% |
San Diego Gas and Electric Company [Member] |  |  |  |  |
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Line Items] |  |  |  |  |
Income tax expense | $ 173 | $ 155 | [1] | $ 280 | [1]
Income before income taxes and equity earnings of unconsolidated entities | 849 | 576 | [1] | 845 | [1]
Pretax income | $ 849 | $ 576 |  | $ 845 |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |
U.S. federal statutory income tax rate | 21.00% | 35.00% |  | 35.00% |
Effects of the TCJA | 0.00% | 5.00% |  | 0.00% |
Depreciation | 3.00% | 7.00% |  | 5.00% |
Compensation-related items | 0.00% | 0.00% |  | (1.00%) |
Resolution of prior years’ income tax items | 0.00% | (4.00%) |  | (1.00%) |
Repairs expenditures | (3.00%) | (8.00%) |  | (4.00%) |
State income taxes, net of federal income tax benefit | 5.00% | 3.00% |  | 5.00% |
Self-developed software expenditures | (2.00%) | (6.00%) |  | (3.00%) |
Allowance for equity funds used during construction | (2.00%) | (4.00%) |  | (2.00%) |
Amortization of excess deferred income taxes | (1.00%) | 0.00% |  | 0.00% |
Other, net | (1.00%) | (1.00%) |  | (1.00%) |
Effective income tax rate | 20.00% | 27.00% |  | 33.00% |
Southern California Gas Company [Member] |  |  |  |  |
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Line Items] |  |  |  |  |
Income tax expense | $ 92 | $ 160 | [1] | $ 143 | [1]
Income before income taxes and equity earnings of unconsolidated entities | 493 | 557 | [1] | 493 | [1]
Pretax income | $ 493 | $ 557 |  | $ 493 |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |
U.S. federal statutory income tax rate | 21.00% | 35.00% |  | 35.00% |
Depreciation | 7.00% | 9.00% |  | 9.00% |
Compensation-related items | 1.00% | 0.00% |  | (1.00%) |
Unrecognized income tax benefits | 4.00% | 0.00% |  | 0.00% |
Resolution of prior years’ income tax items | (1.00%) | (2.00%) |  | 2.00% |
Repairs expenditures | (7.00%) | (8.00%) |  | (9.00%) |
State income taxes, net of federal income tax benefit | 2.00% | 3.00% |  | 2.00% |
Self-developed software expenditures | (3.00%) | (5.00%) |  | (6.00%) |
Allowance for equity funds used during construction | (2.00%) | (3.00%) |  | (2.00%) |
Amortization of excess deferred income taxes | (2.00%) | 0.00% |  | 0.00% |
Other, net | (1.00%) | 0.00% |  | (1.00%) |
Effective income tax rate | 19.00% | 29.00% |  | 29.00% |
[1] | As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.

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