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NEW ACCOUNTING STANDARDS - BALANCE SHEET IMPACT (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other current assets |  | $ 257 | $ 202
Property, plant and equipment, net |  | 36,796 | 36,503
Deferred income taxes |  | 2,571 | 2,767
Other current liabilities |  | 970 | 816
Deferred credits and other |  | 1,529 | 1,602
Retained earnings |  | 10,104 | 10,147
San Diego Gas and Electric Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other current assets |  | 5 | 4
Property, plant and equipment, net |  | 16,310 | 14,838
Deferred income taxes |  | 1,616 | 1,530
Other current liabilities |  | 141 | 147
Deferred credits and other |  | 488 | 544
Retained earnings |  | 4,687 | 4,268
Southern California Gas Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other current assets |  | 31 | 48
Property, plant and equipment, net |  | 12,439 | 11,406
Deferred income taxes |  | 1,177 | 995
Other current liabilities |  | 217 | 137
Deferred credits and other |  | 330 | 345
Retained earnings |  | $ 3,390 | $ 3,040
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other current assets | $ (68) |  |
Property, plant and equipment, net | (147) |  |
Right-of-use assets – operating leases | 623 |  |
Deferred income taxes | (3) |  |
Other current liabilities | 81 |  |
Long-term debt | (138) |  |
Deferred credits and other | 445 |  |
Retained earnings | 17 |  |
Scenario, Forecast [Member] | San Diego Gas and Electric Company [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other current assets | 0 |  |
Property, plant and equipment, net | 0 |  |
Right-of-use assets – operating leases | 130 |  |
Deferred income taxes | 0 |  |
Other current liabilities | 20 |  |
Long-term debt | 0 |  |
Deferred credits and other | 110 |  |
Retained earnings | 0 |  |
Scenario, Forecast [Member] | Southern California Gas Company [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Other current assets | 0 |  |
Property, plant and equipment, net | 0 |  |
Right-of-use assets – operating leases | 116 |  |
Deferred income taxes | 0 |  |
Other current liabilities | 23 |  |
Long-term debt | 0 |  |
Deferred credits and other | 93 |  |
Retained earnings | $ 0 |  |

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