CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 190	$ 288
Restricted cash	35	62
Accounts receivable – trade, net	1,488	1,307
Accounts receivable – other, net	362	277
Due from unconsolidated affiliates	39	37
Income taxes receivable	68	110
Inventories	296	307
Regulatory assets	138	325
Greenhouse gas allowances	59	299
Assets held for sale	713	127
Other	257	202
Total current assets	3,645	3,341
Other assets:
Restricted cash	21	14
Due from unconsolidated affiliates	688	598
Regulatory assets	1,589	1,517
Nuclear decommissioning trusts	974	1,033
Investment in Oncor Holdings	9,652	0
Other investments	2,337	2,527
Goodwill	2,373	2,397
Other intangible assets	272	596
Dedicated assets in support of certain benefit plans	416	455
Insurance receivable for Aliso Canyon costs	461	418
Deferred income taxes	151	170
Greenhouse gas allowances	289	93
Sundry	974	792
Total other assets	20,197	10,610
Property, plant and equipment:
Property, plant and equipment	49,315	48,108
Less accumulated depreciation and amortization	(12,519)	(11,605)
Property, plant and equipment, net	36,796	36,503
Total assets	60,638	50,454
Liabilities, Current [Abstract]
Short-term debt	2,079	1,540
Accounts payable – trade	1,324	1,350
Accounts payable – other	150	173
Due to unconsolidated affiliates	10	7
Dividends and interest payable	499	342
Accrued compensation and benefits	469	439
Regulatory liabilities	105	109
Current portion of long-term debt	1,673	1,427
Reserve for Aliso Canyon costs	160	84
Greenhouse gas obligations	59	299
Liabilities held for sale	25	49
Other	970	816
Total current liabilities	7,523	6,635
Long-term debt	21,611	16,445
Deferred Credits and Other Liabilities [Abstract]
Due to unconsolidated affiliates	37	35
Pension and other postretirement benefit plan obligations, net of plan assets	1,161	1,148
Deferred income taxes	2,571	2,767
Deferred investment tax credits	24	28
Regulatory liabilities	4,016	3,922
Asset retirement obligations	2,787	2,732
Greenhouse gas obligations	131	0
Deferred credits and other	1,529	1,602
Total deferred credits and other liabilities	12,256	12,234
Commitments and contingencies (Note 16)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common stock	5,540	3,149
Retained earnings	10,104	10,147
Accumulated other comprehensive income (loss)	(764)	(626)
Total shareholders’ equity	17,138	12,670
Preferred stock of subsidiary	20	20
Other noncontrolling interests	2,090	2,450
Total equity	19,248	15,140
Total liabilities and equity	60,638	50,454
San Diego Gas and Electric Company [Member]
Current assets:
Cash and cash equivalents	8	12
Restricted cash	11	6
Accounts receivable – trade, net	368	362
Accounts receivable – other, net	106	79
Inventories	102	105
Prepaid expenses	74	58
Regulatory assets	123	316
Fixed-price contracts and other derivatives	82	42
Greenhouse gas allowances	15	116
Other	5	4
Total current assets	894	1,100
Other assets:
Restricted cash	18	11
Regulatory assets	454	451
Nuclear decommissioning trusts	974	1,033
Greenhouse gas allowances	155	83
Sundry	420	328
Total other assets	2,021	1,906
Property, plant and equipment:
Property, plant and equipment	21,662	19,787
Less accumulated depreciation and amortization	(5,352)	(4,949)
Property, plant and equipment, net	16,310	14,838
Total assets	19,225	17,844
Liabilities, Current [Abstract]
Short-term debt	291	253
Accounts payable – trade	439	501
Due to unconsolidated affiliates	61	40
Accrued compensation and benefits	117	122
Regulatory liabilities	53	18
Accrued franchise fees	64	59
Current portion of long-term debt	81	220
Asset retirement obligations	96	77
Customer deposits	70	69
Greenhouse gas obligations	15	116
Other	141	147
Total current liabilities	1,428	1,622
Long-term debt	6,138	5,335
Deferred Credits and Other Liabilities [Abstract]
Pension and other postretirement benefit plan obligations, net of plan assets	212	182
Deferred income taxes	1,616	1,530
Deferred investment tax credits	16	18
Regulatory liabilities	2,404	2,225
Asset retirement obligations	778	762
Greenhouse gas obligations	30	0
Deferred credits and other	488	544
Total deferred credits and other liabilities	5,544	5,261
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	0	0
Common stock	1,338	1,338
Retained earnings	4,687	4,268
Accumulated other comprehensive income (loss)	(10)	(8)
Total shareholders’ equity	6,015	5,598
Other noncontrolling interests	100	28
Total equity	6,115	5,626
Total liabilities and equity	19,225	17,844
Southern California Gas Company [Member]
Current assets:
Cash and cash equivalents	18	8
Accounts receivable – trade, net	634	517
Accounts receivable – other, net	97	90
Due from unconsolidated affiliates	7	4
Inventories	134	124
Regulatory assets	12	9
Greenhouse gas allowances	37	179
Other	31	48
Total current assets	970	979
Other assets:
Regulatory assets	1,051	983
Insurance receivable for Aliso Canyon costs	461	418
Greenhouse gas allowances	116	9
Sundry	352	364
Total other assets	1,980	1,774
Property, plant and equipment:
Property, plant and equipment	18,138	16,772
Less accumulated depreciation and amortization	(5,699)	(5,366)
Property, plant and equipment, net	12,439	11,406
Total assets	15,389	14,159
Liabilities, Current [Abstract]
Short-term debt	256	116
Accounts payable – trade	556	502
Accounts payable – other	93	93
Due to unconsolidated affiliates	34	35
Accrued compensation and benefits	159	151
Regulatory liabilities	52	91
Current portion of long-term debt	3	501
Asset retirement obligations	90	68
Customer deposits	101	89
Reserve for Aliso Canyon costs	160	84
Greenhouse gas obligations	37	179
Other	217	137
Total current liabilities	1,758	2,046
Long-term debt	3,427	2,485
Deferred Credits and Other Liabilities [Abstract]
Pension obligation, net of plan assets	760	789
Deferred income taxes	1,177	995
Deferred investment tax credits	8	10
Regulatory liabilities	1,612	1,697
Asset retirement obligations	1,973	1,885
Greenhouse gas obligations	86	0
Deferred credits and other	330	345
Total deferred credits and other liabilities	5,946	5,721
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	22	22
Common stock	866	866
Retained earnings	3,390	3,040
Accumulated other comprehensive income (loss)	(20)	(21)
Total shareholders’ equity	4,258	3,907
Total equity	4,258	3,907
Total liabilities and equity	15,389	14,159
Series A Preferred Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	1,693	0
Series B Preferred Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	$ 565	$ 0