CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property, plant and equipment, net related to VIE	$ 31,487	$ 28,039	[1]
Long term debt related to VIE	$ 13,522	$ 13,134	[1]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized	50,000,000	50,000,000	[1]
Preferred stock, shares issued	0	0	[1]
Common stock, shares authorized	750,000,000	750,000,000	[1]
Common stock, shares outstanding	250,000,000	248,000,000	[1]
Common stock, No par value (in dollars per share)	$ 0	$ 0	[1]
Otay Mesa VIE [Member]
Property, plant and equipment, net related to VIE	$ 365	$ 383	[1]
Long term debt related to VIE	296	303	[1]
San Diego Gas and Electric Company [Member]
Property, plant and equipment, net related to VIE	12,852	12,256	[1]
Long term debt related to VIE	$ 4,660	$ 4,455	[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	$ 365	$ 383
Long term debt related to VIE	296	303
Southern California Gas Company [Member]
Property, plant and equipment, net related to VIE	10,189	9,271	[1]
Long term debt related to VIE	$ 2,982	$ 2,481	[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.