CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property, plant and equipment, net related to VIE	$ 295	$ 321
Current portion of long-term debt	1,673	1,427
Long-term debt, VIE	$ 190	$ 284
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares outstanding (in shares)	273,769,513	251,358,977
San Diego Gas and Electric Company [Member]
Property, plant and equipment, net related to VIE	$ 295	$ 321
Current portion of long-term debt	81	220
Long-term debt, VIE	$ 190	$ 284
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized (in shares)	45,000,000	45,000,000
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares issued (in shares)	0	0
Common stock, shares authorized (in shares)	255,000,000	255,000,000
Common stock, shares outstanding (in shares)	117,000,000	117,000,000
Southern California Gas Company [Member]
Current portion of long-term debt	$ 3	$ 501
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized (in shares)	11,000,000	11,000,000
Preferred stock, shares outstanding (in shares)	1,000,000	1,000,000
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares outstanding (in shares)	91,000,000	91,000,000
Otay Mesa VIE [Member]
Current portion of long-term debt	$ 28	$ 10
Otay Mesa VIE [Member] | San Diego Gas and Electric Company [Member]
Current portion of long-term debt	$ 28	$ 10
Series A Preferred Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares outstanding (in shares)	17,250,000
Preferred stock, shares issued (in shares)	17,250,000
Series B Preferred Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares outstanding (in shares)	5,750,000
Preferred stock, shares issued (in shares)	5,750,000