ACQUISTIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - Discontinued Operations (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended								12 Months Ended
	Jun. 30, 2020	Apr. 30, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 24, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of income tax			$ 0	$ (7)	$ 1,777	$ 80	$ 71	$ 256	$ 78	$ (42)	$ 1,850	$ 363	$ 188
Earnings attributable to noncontrolling interests											(10)	(35)	(32)
Income (loss) from discontinued operations, net of income tax											1,840	328	156
Restricted cash			0				75				0	75
Assets held for sale in discontinued operations			0				445				0	445
Noncurrent assets			0				3,513				0	3,513
Liabilities held for sale in discontinued operations			0				444				0	444
Noncurrent liabilities			0				1,052				0	1,052
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
After tax gain on sale											2,899	0	0
Revenues											570	1,614	1,585
Cost of sales											(364)	(1,012)	(1,041)
Operating expenses											(66)	(159)	(206)
Interest and other											(3)	(11)	(6)
Income before income taxes and equity earnings											3,036	432	332
Income tax expense											(1,186)	(72)	(145)
Equity earnings											0	3	1
Income from discontinued operations, net of income tax											1,850	363	188
Income (loss) from discontinued operations, net of income tax											1,840	328	$ 156
Cash and cash equivalents			4,600				74				4,600	74
Restricted cash							1					1
Accounts receivable, net							303					303
Due from unconsolidated affiliates							2					2
Inventories							36					36
Other current assets							29					29
Assets held for sale in discontinued operations							445					445
Due from unconsolidated affiliates							54					54
Goodwill and other intangible assets							801					801
Property, plant and equipment, net							2,618					2,618
Other noncurrent assets							40					40
Noncurrent assets							3,513					3,513
Short-term debt							52					52
Accounts payable							201					201
Current portion of long-term debt and finance leases							85					85
Other current liabilities							106					106
Liabilities held for sale in discontinued operations							444					444
Long-term debt and finance leases							702					702
Deferred income taxes							284					284
Other noncurrent liabilities							66					66
Noncurrent liabilities							$ 1,052					$ 1,052
Cumulative foreign currency translation adjustments			$ 645								$ 645
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member] | Luz Del Sur [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale		$ 3,549												$ 3,549
Pretax gain on sale		2,271
After tax gain on sale		$ 1,499
Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member] | Chilquinta Energia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale	$ 2,216				$ 2,216
Pretax gain on sale	628
After tax gain on sale	$ 248
Chilquinta Energia [Member] | Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)			100.00%								100.00%
Luz Del Sur [Member] | Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)			83.60%								83.60%
Eletrans [Member] | Discontinued Operations, Held-for-sale [Member] | Sempra South American Utilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest (as a percent)	50.00%				50.00%