GENERAL INFORMATION AND OTHER FINANCIAL DATA - CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 168	$ 102	[1]
Restricted cash, current	50	35	[1]
Restricted cash, noncurrent	21	21	[1]
Cash and cash equivalents	55	88
Total cash, cash equivalents and restricted cash on the Condensed Consolidated Statements of Cash Flows	294	246
San Diego Gas and Electric Company [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	3	8	[1]
Restricted cash, current	13	11	[1]
Restricted cash, noncurrent	18	18	[1]
Total cash, cash equivalents and restricted cash on the Condensed Consolidated Statements of Cash Flows	$ 34	$ 37

[1] Derived from audited financial statements.