CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 108	$ 102
Restricted cash	31	35
Accounts receivable – trade, net	1,261	1,215
Accounts receivable – other, net	455	320
Due from unconsolidated affiliates	32	37
Income taxes receivable	112	60
Inventories	277	258
Regulatory assets	222	138
Greenhouse gas allowances	72	59
Other current assets	324	249
Total current assets	3,339	3,645
Other assets:
Restricted cash	3	21
Due from unconsolidated affiliates	742	644
Regulatory assets	1,930	1,589
Nuclear decommissioning trusts	1,082	974
Investment in Oncor Holdings	11,519	9,652
Other investments	2,103	2,320
Goodwill	1,602	1,602
Other intangible assets	213	224
Dedicated assets in support of certain benefit plans	488	416
Insurance receivable for Aliso Canyon costs	339	461
Deferred income taxes	155	141
Greenhouse gas allowances	470	289
Right-of-use assets – operating leases	591
Prepaid Insurance Fund Asset, Noncurrent	392	0
Assets held for sale in discontinued operations	3,513	3,259
Other long-term assets	732	962
Total other assets	25,874	22,554
Property, plant and equipment:
Property, plant and equipment	49,329	46,615
Less accumulated depreciation and amortization	(12,877)	(12,176)
Property, plant and equipment, net	36,452	34,439
Total assets	65,665	60,638
Liabilities, Current [Abstract]
Short-term debt	3,505	2,024
Accounts payable – trade	1,234	1,160
Accounts payable – other	179	138
Due to unconsolidated affiliates	5	10
Dividends and interest payable	515	480
Accrued compensation and benefits	476	440
Regulatory liabilities	319	105
Current portion of long-term debt and finance leases	1,526	1,644
Reserve for Aliso Canyon costs	9	160
Greenhouse gas obligations	72	59
Liabilities held for sale in discontinued operations	444	368
Other current liabilities	866	935
Total current liabilities	9,150	7,523
Long-term debt and finance leases	20,785	20,903
Deferred Credits and Other Liabilities [Abstract]
Due to unconsolidated affiliates	195	37
Pension and other postretirement benefit plan obligations, net of plan assets	1,067	1,143
Deferred income taxes	2,577	2,321
Deferred investment tax credits	21	24
Regulatory liabilities	3,741	4,016
Asset retirement obligations	2,923	2,786
Greenhouse gas obligations	301	131
Liabilities held for sale in discontinued operations	1,052	1,013
Deferred credits and other	2,048	1,493
Total deferred credits and other liabilities	13,925	12,964
Commitments and contingencies (Note 16)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common stock	7,480	5,540
Retained earnings	11,130	10,104
Accumulated other comprehensive income (loss)	(939)	(764)
Total shareholders’ equity	19,929	17,138
Preferred stock of subsidiary	20	20
Other noncontrolling interests	1,856	2,090
Total equity	21,805	19,248
Total liabilities and equity	65,665	60,638
San Diego Gas and Electric Company [Member]
Current assets:
Cash and cash equivalents	10	8
Restricted cash	0	11
Accounts receivable – trade, net	398	368
Accounts receivable – other, net	119	106
Income taxes receivable	128	0
Inventories	94	102
Prepaid expenses	120	74
Regulatory assets	209	123
Fixed-price contracts and other derivatives	43	82
Greenhouse gas allowances	13	15
Other current assets	24	5
Total current assets	1,158	894
Other assets:
Restricted cash	0	18
Regulatory assets	440	454
Nuclear decommissioning trusts	1,082	974
Greenhouse gas allowances	189	155
Right-of-use assets – operating leases	130
Prepaid Insurance Fund Asset, Noncurrent	392	0
Other long-term assets	202	420
Total other assets	2,435	2,021
Property, plant and equipment:
Property, plant and equipment	22,504	21,662
Less accumulated depreciation and amortization	(5,537)	(5,352)
Property, plant and equipment, net	16,967	16,310
Total assets	20,560	19,225
Liabilities, Current [Abstract]
Short-term debt	80	291
Accounts payable – trade	496	439
Due to unconsolidated affiliates	53	61
Accrued compensation and benefits	138	117
Regulatory liabilities	76	53
Accrued franchise fees	53	64
Current portion of long-term debt and finance leases	56	81
Contract with Customer, Liability, Current	74	70
Asset retirement obligations	95	96
Greenhouse gas obligations	13	15
Other current liabilities	176	141
Total current liabilities	1,310	1,428
Long-term debt and finance leases	6,306	6,138
Deferred Credits and Other Liabilities [Abstract]
Pension and other postretirement benefit plan obligations, net of plan assets	153	212
Deferred income taxes	1,848	1,616
Deferred investment tax credits	14	16
Regulatory liabilities	2,319	2,404
Asset retirement obligations	771	778
Greenhouse gas obligations	62	30
Deferred credits and other	677	488
Total deferred credits and other liabilities	5,844	5,544
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	0	0
Common stock	1,660	1,338
Retained earnings	5,456	4,687
Accumulated other comprehensive income (loss)	(16)	(10)
Total shareholders’ equity	7,100	6,015
Other noncontrolling interests	0	100
Total equity	7,100	6,115
Total liabilities and equity	20,560	19,225
Southern California Gas Company [Member]
Current assets:
Cash and cash equivalents	10	18
Accounts receivable – trade, net	710	634
Accounts receivable – other, net	87	97
Due from unconsolidated affiliates	11	7
Income taxes receivable	161	2
Inventories	136	134
Regulatory assets	7	12
Greenhouse gas allowances	52	37
Other current assets	44	29
Total current assets	1,218	970
Other assets:
Regulatory assets	1,407	1,051
Insurance receivable for Aliso Canyon costs	339	461
Greenhouse gas allowances	248	116
Right-of-use assets – operating leases	94
Other long-term assets	447	352
Total other assets	2,535	1,980
Property, plant and equipment:
Property, plant and equipment	19,362	18,138
Less accumulated depreciation and amortization	(6,038)	(5,699)
Property, plant and equipment, net	13,324	12,439
Total assets	17,077	15,389
Liabilities, Current [Abstract]
Short-term debt	630	256
Accounts payable – trade	545	556
Accounts payable – other	110	93
Due to unconsolidated affiliates	47	34
Accrued compensation and benefits	182	159
Regulatory liabilities	243	52
Current portion of long-term debt and finance leases	6	3
Contract with Customer, Liability, Current	71	101
Asset retirement obligations	65	90
Reserve for Aliso Canyon costs	9	160
Greenhouse gas obligations	52	37
Other current liabilities	222	217
Total current liabilities	2,182	1,758
Long-term debt and finance leases	3,788	3,427
Deferred Credits and Other Liabilities [Abstract]
Pension obligation, net of plan assets	785	760
Deferred income taxes	1,403	1,177
Deferred investment tax credits	7	8
Regulatory liabilities	1,422	1,612
Asset retirement obligations	2,112	1,973
Greenhouse gas obligations	208	86
Deferred credits and other	422	330
Total deferred credits and other liabilities	6,359	5,946
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	22	22
Common stock	866	866
Retained earnings	3,883	3,390
Accumulated other comprehensive income (loss)	(23)	(20)
Total shareholders’ equity	4,748	4,258
Total equity	4,748	4,258
Total liabilities and equity	17,077	15,389
Series A Preferred Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	1,693	1,693
Series B Preferred Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred stock	565	565
Disposal Group, Not Discontinued Operations [Member]
Current assets:
Assets held for sale	0	713
Discontinued Operations, Held-for-sale [Member]
Current assets:
Assets held for sale	$ 445	$ 459