CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Property, plant and equipment, net related to VIE	$ 33,492	$ 32,931	[1]
Long term debt related to VIE	$ 14,409	$ 14,429	[1]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares outstanding	251,000,000	250,000,000
Common stock, No par value (in dollars per share)	$ 0	$ 0
Otay Mesa VIE [Member]
Property, plant and equipment, net related to VIE	$ 342	$ 354
Long term debt related to VIE	291	293
San Diego Gas and Electric Company [Member]
Property, plant and equipment, net related to VIE	13,467	13,250	[1]
Long term debt related to VIE	$ 4,638	$ 4,658	[1]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, shares authorized	255,000,000	255,000,000
Common stock, shares outstanding	117,000,000	117,000,000
Common stock, No par value (in dollars per share)	$ 0	$ 0
San Diego Gas and Electric Company [Member] | Otay Mesa VIE [Member]
Property, plant and equipment, net related to VIE	$ 342	$ 354
Long term debt related to VIE	291	293
Southern California Gas Company [Member]
Property, plant and equipment, net related to VIE	10,443	10,252	[1]
Long term debt related to VIE	$ 2,983	$ 2,982	[1]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	91,000,000	91,000,000
Common stock, No par value (in dollars per share)	$ 0	$ 0

[1] Derived from audited financial statements.