REVENUES - RECEIVABLES FROM REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	$ 1,754	$ 1,977
Accounts receivable – trade, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	1,697	1,886
Accounts receivable – other, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	12	19
Due from unconsolidated affiliates – current
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	3	2
Other long-term assets
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	42	70
San Diego Gas and Electric Company
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	778	751
San Diego Gas and Electric Company | Accounts receivable – trade, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	742	715
San Diego Gas and Electric Company | Accounts receivable – other, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	11	9
San Diego Gas and Electric Company | Due from unconsolidated affiliates – current
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	3	2
San Diego Gas and Electric Company | Other long-term assets
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	22	25
Southern California Gas Company
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	891	1,139
Southern California Gas Company | Accounts receivable – trade, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	870	1,084
Southern California Gas Company | Accounts receivable – other, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	1	10
Southern California Gas Company | Other long-term assets
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	$ 20	$ 45