ACQUISTIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 12, 2019	Sep. 27, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income tax									$ 363	$ 188	$ (31)
Earnings attributable to noncontrolling interests									(35)	(32)	(27)
(Loss) income from discontinued operations, net of income tax	$ 71	$ 256	$ 78	$ (42)	$ 51	$ 54	$ 55	$ 28	328	156	(58)
Cash, cash equivalents and restricted cash in discontinued operations	75				88				75	88
Noncurrent assets	3,513				3,259				3,513	3,259
Liabilities held for sale in discontinued operations	444				368				444	368
Noncurrent liabilities	1,052				1,013				1,052	1,013
Discontinued Operations, Held-for-sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	445				459				445	459
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]
Proceeds from sale													$ 3,590
Revenues									1,614	1,585	1,567
Cost of sales									(1,012)	(1,041)	(1,060)
Operating expenses									(159)	(206)	(202)
Interest and other									(11)	(6)	(2)
Income before income taxes and equity earnings									432	332	303
Income tax expense									(72)	(145)	(338)
Equity earnings									3	1	4
Income (loss) from discontinued operations, net of income tax									363	188	(31)
(Loss) income from discontinued operations, net of income tax									328	156	$ (58)
Cash and cash equivalents	74				88				74	88
Cash, cash equivalents and restricted cash in discontinued operations	1				0				1	0
Accounts receivable, net	303				315				303	315
Due from unconsolidated affiliates	2				2				2	2
Inventories	36				38				36	38
Other current assets	29				16				29	16
Assets held for sale	445				459				445	459
Due from unconsolidated affiliates	54				44				54	44
Goodwill and other intangible assets	801				819				801	819
Property, plant and equipment, net	2,618				2,357				2,618	2,357
Other noncurrent assets	40				39				40	39
Noncurrent assets	3,513				3,259				3,513	3,259
Short-term debt	52				55				52	55
Accounts payable	201				176				201	176
Current portion of long-term debt and finance leases	85				29				85	29
Other current liabilities	106				108				106	108
Liabilities held for sale in discontinued operations	444				368				444	368
Long-term debt and finance leases	702				708				702	708
Deferred income taxes	284				250				284	250
Other noncurrent liabilities	66				55				66	55
Noncurrent liabilities	1,052				1,013				1,052	1,013
Cumulative foreign currency translation adjustments	$ 551				$ 506				$ 551	$ 506
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	100.00%								100.00%			100.00%
Proceeds from sale												$ 2,230
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	83.60%								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												50.00%
Eletrans [Member] | 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												50.00%
Eletrans [Member] | State Grid International Development Limited [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												100.00%