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GENERAL INFORMATION AND OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Dec. 31, 2019
Variable Interest Entities [Line Items]      
Equity method investment   $ 11,619 $ 11,519 [1]
ASSETS   68,293 65,665 [1]
Sempra Texas Utilities [Member] | Oncor Holdings [Member]      
Variable Interest Entities [Line Items]      
Equity method investment   11,619 11,519
Sempra LNG [Member] | Cameron LNG Holdings [Member]      
Variable Interest Entities [Line Items]      
Equity method investment   $ 1,184 1,256
Oncor Electric Delivery Company LLC. [Member]      
Variable Interest Entities [Line Items]      
Ownership percentage in consolidated entity 19.75%    
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utilities [Member]      
Variable Interest Entities [Line Items]      
Ownership interest (as a percent)   80.25%  
Sempra Texas Holdings Corp [Member] | Oncor Holdings [Member] | Sempra Texas Intermediate Holding Company LLC [Member]      
Variable Interest Entities [Line Items]      
Ownership percentage in consolidated entity   100.00%  
Variable Interest Entity, Primary Beneficiary | Sempra Mexico [Member]      
Variable Interest Entities [Line Items]      
ASSETS   $ 131 $ 126
[1]
Derived from audited financial statements.