CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current portion of long-term debt and finance leases	$ 1,526	$ 1,644
Long-term debt, VIE		$ 190
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)	291,712,925	273,769,513
San Diego Gas and Electric Company [Member]
Property, plant and equipment, net related to VIE		$ 295
Current portion of long-term debt and finance leases	$ 56	81
Long-term debt, VIE		$ 190
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 and finance leases	$ 6	$ 3
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 and finance leases		$ 28
Otay Mesa VIE [Member] | San Diego Gas and Electric Company [Member]
Current portion of long-term debt and finance leases		$ 28
Series A Preferred Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, percent	6.00%
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, percent	6.75%
Preferred stock, shares outstanding (in shares)	5,750,000
Preferred stock, shares issued (in shares)	5,750,000