GENERAL INFORMATION AND OTHER FINANCIAL DATA - CREDIT LOSSES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	$ 1,754		$ 1,977
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	136	$ 138
Provisions for expected credit losses	48	43
Write-offs	(19)	(5)
Ending balance	165	176
Allowance for credit losses	7		8
San Diego Gas and Electric Company
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	778		751
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	66	69
Provisions for expected credit losses	21	15
Write-offs	(9)	(3)
Ending balance	78	81
San Diego Gas and Electric Company | Customers Under California Arrearage Payment Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers			63
Southern California Gas Company
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	891		1,139
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	69	68
Provisions for expected credit losses	26	28
Write-offs	(10)	(2)
Ending balance	85	$ 94
Southern California Gas Company | Customers Under California Arrearage Payment Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers			79
Accounts receivable – trade, net
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Current	125		94
Accounts receivable – trade, net | San Diego Gas and Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Current	55		42
Accounts receivable – trade, net | Southern California Gas Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Current	68		51
Accounts receivable – other, net
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	12		19
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Current	38		39
Accounts receivable – other, net | San Diego Gas and Electric Company
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	11		9
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Current	22		22
Accounts receivable – other, net | Southern California Gas Company
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	1		10
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Accounts Receivable, Allowance for Credit Loss, Current	16		17
Other long-term assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	42		70
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Expected credit losses, noncurrent	2		3
Other long-term assets | KKR
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Expected credit losses, noncurrent	7		8
Other long-term assets | San Diego Gas and Electric Company
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	22		25
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Expected credit losses, noncurrent	1		2
Other long-term assets | Southern California Gas Company
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivables from revenues from contracts with customers	20		45
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Expected credit losses, noncurrent	1		1
Due from Unconsolidated Affiliates - Noncurrent
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses			1
Sempra LNG | Deferred Credits and Other
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses	$ 6		$ 7