GENERAL INFORMATION AND OTHER FINANCIAL DATA - CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019		Sep. 30, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 3,515	$ 108	[1]
Restricted cash, current	28	31	[1]
Restricted cash, noncurrent	3	3	[1]
Cash, cash equivalents and restricted cash in discontinued operations	0	75
Total cash, cash equivalents and restricted cash on the Condensed Consolidated Statements of Cash Flows	3,546	217		$ 497	$ 246
Sempra South American Utilities [Member] | Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash, cash equivalents and restricted cash in discontinued operations	$ 4,600	$ 74

[1] Derived from audited financial statements.