REVENUES - RECEIVABLES FROM REVENUES FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	$ 1,977	$ 1,462	$ 1,184
Accounts receivable – trade, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	1,886	1,447	1,163
Accounts receivable – other, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	19	12	16
Due from unconsolidated affiliates – current
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	2	3	5
Other long-term assets
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	70	0	0
San Diego Gas and Electric Company [Member]
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	751	583	405
San Diego Gas and Electric Company [Member] | Customers Under California Arrearage Payment Program
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	63
San Diego Gas and Electric Company [Member] | Accounts receivable – trade, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	715	573	398
San Diego Gas and Electric Company [Member] | Accounts receivable – other, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	9	8	5
San Diego Gas and Electric Company [Member] | Due from unconsolidated affiliates – current
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	2	2	2
San Diego Gas and Electric Company [Member] | Other long-term assets
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	25	0	0
SoCalGas
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	1,139	790	721
SoCalGas | Customers Under California Arrearage Payment Program
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	79
SoCalGas | Accounts receivable – trade, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	1,084	786	710
SoCalGas | Accounts receivable – other, net
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	10	4	11
SoCalGas | Other long-term assets
Contract with Customer, Asset [Line Items]
Receivables from revenues from contracts with customers	$ 45	$ 0	$ 0