NEW ACCOUNTING STANDARDS (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	[1]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sundry	$ 262		$ 249
Property, plant and equipment, net	34,698		34,439
Right-of-use assets – operating leases	612
Deferred Income Tax Assets, Net	139		141
Deferred income tax assets	2,622		2,321
Other current liabilities	993		935
Deferred credits and other	1,949		1,493
Retained earnings	10,337		10,104
Regulatory liabilities	3,996		4,016
Accumulated other comprehensive income (loss)	(817)		(764)
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sundry		$ (71)
Property, plant and equipment, net		(147)
Right-of-use assets – operating leases		603
Deferred Income Tax Assets, Net		(3)
Other current liabilities		80
Long-term debt		(138)
Deferred credits and other		436
Retained earnings		17
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		40
Regulatory liabilities		2
Accumulated other comprehensive income (loss)		42
San Diego Gas and Electric Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sundry	26		5
Property, plant and equipment, net	16,464		16,310
Right-of-use assets – operating leases	135
Deferred income tax assets	1,653		1,616
Other current liabilities	280		141
Deferred credits and other	610		488
Retained earnings	4,865		4,687
Regulatory liabilities	2,470		2,404
Accumulated other comprehensive income (loss)	(12)		(10)
San Diego Gas and Electric Company [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sundry		0
Property, plant and equipment, net		0
Right-of-use assets – operating leases		130
Deferred Tax Assets, Net		0
Other current liabilities		20
Long-term debt		0
Deferred credits and other		110
Retained earnings		0
San Diego Gas and Electric Company [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		2
Accumulated other comprehensive income (loss)		2
Southern California Gas Company [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sundry	39		31
Property, plant and equipment, net	12,581		12,439
Right-of-use assets – operating leases	110
Deferred income tax assets	1,204		1,177
Other current liabilities	333		217
Deferred credits and other	422		330
Retained earnings	3,656		3,390
Regulatory liabilities	1,526		1,612
Accumulated other comprehensive income (loss)	$ (24)		$ (20)
Southern California Gas Company [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sundry		0
Property, plant and equipment, net		0
Right-of-use assets – operating leases		116
Deferred Tax Assets, Net		0
Other current liabilities		23
Long-term debt		0
Deferred credits and other		93
Retained earnings		0
Southern California Gas Company [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		2
Regulatory liabilities		2
Accumulated other comprehensive income (loss)		4
Disposal Group Held-for-sale [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Current		13
Disposal Group Held-for-sale [Member] | San Diego Gas and Electric Company [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Current		0
Disposal Group Held-for-sale [Member] | Southern California Gas Company [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets Held-for-sale, Not Part of Disposal Group, Current		$ 0

[1] Derived from audited financial statements.