v3.8.0.1
SEGMENT INFORMATION (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 7    
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES $ 2,962,000,000 $ 3,031,000,000  
INTEREST EXPENSE 216,000,000 169,000,000 [1]  
INTEREST INCOME 33,000,000 6,000,000 [1]  
DEPRECIATION AND AMORTIZATION 386,000,000 360,000,000  
INCOME TAX EXPENSE (BENEFIT) 289,000,000 295,000,000 [1]  
Equity earnings, before income tax 5,000,000 3,000,000  
Equity losses, net of income tax (25,000,000) (8,000,000)  
Equity losses (20,000,000) (5,000,000) [1]  
Earnings (losses) 347,000,000 441,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 1,035,000,000 992,000,000  
ASSETS 60,485,000,000   $ 50,454,000,000 [2]
EQUITY METHOD AND OTHER INVESTMENTS 11,766,000,000   2,527,000,000
Operating Segments [Member] | SDG&E [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 1,055,000,000 1,057,000,000  
INTEREST EXPENSE 52,000,000 49,000,000  
INTEREST INCOME 1,000,000 0  
DEPRECIATION AND AMORTIZATION 166,000,000 163,000,000  
INCOME TAX EXPENSE (BENEFIT) 56,000,000 90,000,000  
Earnings (losses) 170,000,000 155,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 475,000,000 418,000,000  
ASSETS 18,017,000,000   17,844,000,000
Operating Segments [Member] | SoCalGas [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 1,126,000,000 1,241,000,000  
INTEREST EXPENSE 27,000,000 25,000,000  
DEPRECIATION AND AMORTIZATION 135,000,000 126,000,000  
INCOME TAX EXPENSE (BENEFIT) 59,000,000 98,000,000  
Earnings (losses) 225,000,000 203,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 403,000,000 357,000,000  
ASSETS 14,462,000,000   14,159,000,000
Operating Segments [Member] | Sempra Texas Utility [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Equity losses, net of income tax 15,000,000 0  
Earnings (losses) 15,000,000 0  
Segment Reporting Information, Additional Information [Abstract]      
ASSETS 9,176,000,000   0
EQUITY METHOD AND OTHER INVESTMENTS 9,176,000,000   0
Operating Segments [Member] | Sempra South American Utilities [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 426,000,000 412,000,000  
INTEREST EXPENSE 10,000,000 9,000,000  
INTEREST INCOME 6,000,000 5,000,000  
DEPRECIATION AND AMORTIZATION 14,000,000 13,000,000  
INCOME TAX EXPENSE (BENEFIT) 20,000,000 19,000,000  
Equity losses, net of income tax 1,000,000 1,000,000  
Earnings (losses) 46,000,000 47,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 56,000,000 43,000,000  
ASSETS 4,154,000,000   4,060,000,000
EQUITY METHOD AND OTHER INVESTMENTS 17,000,000   16,000,000
Operating Segments [Member] | Sempra Mexico [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 308,000,000 264,000,000  
INTEREST EXPENSE 30,000,000 32,000,000  
INTEREST INCOME 15,000,000 2,000,000  
DEPRECIATION AND AMORTIZATION 43,000,000 36,000,000  
INCOME TAX EXPENSE (BENEFIT) 155,000,000 142,000,000  
Equity losses, net of income tax (41,000,000) (9,000,000)  
Earnings (losses) 20,000,000 48,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 59,000,000 94,000,000  
ASSETS 8,798,000,000   8,554,000,000
EQUITY METHOD AND OTHER INVESTMENTS 613,000,000   624,000,000
Operating Segments [Member] | Sempra Renewables [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 25,000,000 22,000,000  
INTEREST EXPENSE 5,000,000 4,000,000  
INTEREST INCOME 2,000,000 1,000,000  
DEPRECIATION AND AMORTIZATION 13,000,000 9,000,000  
INCOME TAX EXPENSE (BENEFIT) (7,000,000) (11,000,000)  
Equity earnings, before income tax 5,000,000 2,000,000  
Earnings (losses) 21,000,000 11,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 31,000,000 69,000,000  
ASSETS 2,764,000,000   2,898,000,000
EQUITY METHOD AND OTHER INVESTMENTS 798,000,000   813,000,000
Operating Segments [Member] | Sempra LNG & Midstream [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 104,000,000 132,000,000  
INTEREST EXPENSE 8,000,000 11,000,000  
INTEREST INCOME 13,000,000 17,000,000  
DEPRECIATION AND AMORTIZATION 11,000,000 10,000,000  
INCOME TAX EXPENSE (BENEFIT) 12,000,000 1,000,000  
Equity earnings, before income tax 0 1,000,000  
Earnings (losses) (16,000,000) 1,000,000  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 6,000,000 3,000,000  
ASSETS 4,904,000,000   4,872,000,000
EQUITY METHOD AND OTHER INVESTMENTS 1,085,000,000   997,000,000
Adjustments and eliminations [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES (1,000,000) 0  
All other [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
INTEREST EXPENSE 112,000,000 68,000,000  
INTEREST INCOME 14,000,000 0  
DEPRECIATION AND AMORTIZATION 4,000,000 3,000,000  
INCOME TAX EXPENSE (BENEFIT) (6,000,000) (44,000,000)  
Earnings (losses) (134,000,000) (24,000,000)  
Segment Reporting Information, Additional Information [Abstract]      
EXPENDITURES FOR PROPERTY, PLANT & EQUIPMENT 5,000,000 8,000,000  
ASSETS 964,000,000   915,000,000
EQUITY METHOD AND OTHER INVESTMENTS 77,000,000   77,000,000
Intersegment eliminations [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES (81,000,000) (97,000,000)  
INTEREST EXPENSE (28,000,000) (29,000,000)  
INTEREST INCOME (18,000,000) (19,000,000)  
Segment Reporting Information, Additional Information [Abstract]      
ASSETS (2,754,000,000)   $ (2,848,000,000)
Intersegment eliminations [Member] | SDG&E [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 1,000,000 1,000,000  
Intersegment eliminations [Member] | SoCalGas [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 17,000,000 18,000,000  
Intersegment eliminations [Member] | Sempra Mexico [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES 29,000,000 25,000,000  
Intersegment eliminations [Member] | Sempra LNG & Midstream [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
REVENUES $ 34,000,000 $ 53,000,000  
Oncor Electric Delivery Company LLC. [Member] | Oncor Holdings [Member] | Sempra Texas Utility [Member]      
Segment Reporting Information [Line Items]      
Ownership interest 80.25%    
[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.
[2] Derived from audited financial statements.