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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	$ 12,670
Amounts reclassified from AOCI(2)	21	$ 19	$ 18
Cumulative-effect adjustment from change in accounting priniciple		(1)		$ 107
AOCI, ending balance	17,138	12,670
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Sale of noncontrolling interests, net of offering costs	90	196	1,701
San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	5,598
Amounts reclassified from AOCI(2)	4	1	1
Cumulative-effect adjustment from change in accounting priniciple				23
AOCI, ending balance	6,015	5,598
Southern California Gas Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	3,907
Amounts reclassified from AOCI(2)	2	1	1
Cumulative-effect adjustment from change in accounting priniciple				$ 15
AOCI, ending balance	4,258	3,907
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(420)	(527)	(582)
OCI before reclassifications	(144)	107	42
Amounts reclassified from AOCI(2)	0	0	13
Total other comprehensive income (loss)	(144)	107	55
Cumulative-effect adjustment from change in accounting priniciple		0
AOCI, ending balance	(564)	(420)	(527)
Financial instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(122)	(125)	(137)
OCI before reclassifications	40	(4)	(7)
Amounts reclassified from AOCI(2)	3	7	19
Total other comprehensive income (loss)	43	3	12
Cumulative-effect adjustment from change in accounting priniciple		(3)
AOCI, ending balance	(82)	(122)	(125)
Financial instruments [Member] | Southern California Gas Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(13)	(13)	(14)
OCI before reclassifications	0		0
Amounts reclassified from AOCI(2)	1	0	1
Total other comprehensive income (loss)	1	0	1
AOCI, ending balance	(12)	(13)	(13)
Pension and other postretirement benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(84)	(96)	(87)
OCI before reclassifications	(52)	0	(15)
Amounts reclassified from AOCI(2)	18	12	6
Total other comprehensive income (loss)	(34)	12	(9)
Cumulative-effect adjustment from change in accounting priniciple		0
AOCI, ending balance	(118)	(84)	(96)
Pension and other postretirement benefits [Member] | San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(8)	(8)	(8)
OCI before reclassifications	(6)	(1)	(1)
Amounts reclassified from AOCI(2)	4	1	1
Total other comprehensive income (loss)	(2)	0	0
AOCI, ending balance	(10)	(8)	(8)
Pension and other postretirement benefits [Member] | Southern California Gas Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(8)	(9)	(5)
OCI before reclassifications	(1)		(4)
Amounts reclassified from AOCI(2)	1	1	0
Total other comprehensive income (loss)	0	1	(4)
AOCI, ending balance	(8)	(8)	(9)
Accumulated other comprehensive income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(626)	(748)	(806)
OCI before reclassifications	(156)	103	20
Amounts reclassified from AOCI(2)	21	19	38
Total other comprehensive income (loss)	(135)	122	58
Cumulative-effect adjustment from change in accounting priniciple		(3)
AOCI, ending balance	(764)	(626)	(748)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Sale of noncontrolling interests, net of offering costs			20
Accumulated other comprehensive income (loss) [Member] | San Diego Gas and Electric Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(8)	(8)	(8)
OCI before reclassifications	(6)	(1)	(1)
Amounts reclassified from AOCI(2)	4	1	1
Total other comprehensive income (loss)	(2)	0	0
AOCI, ending balance	(10)	(8)	(8)
Accumulated other comprehensive income (loss) [Member] | Southern California Gas Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, beginning balance	(21)	(22)	(19)
OCI before reclassifications	(1)		(4)
Amounts reclassified from AOCI(2)	2	1	1
Total other comprehensive income (loss)	1	1	(3)
AOCI, ending balance	$ (20)	$ (21)	$ (22)

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