OTHER FINANCIAL DATA - EARNINGS PER SHARE (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Numerator [Abstract]
Earnings	$ 269		$ 245	$ 516	$ 423
Earnings Per Share Denominator [Abstract]
Weighted-average common shares outstanding for basic EPS	245,688,000		243,603,000	245,484,000	243,449,000
Dilutive effect of stock options, restricted stock awards and restricted stock units	4,373,000		4,912,000	4,332,000	4,830,000
Weighted-average common shares outstanding for diluted EPS	250,061,000		248,515,000	249,816,000	248,279,000
Earnings Per Share [Abstract]
Basic earnings per common share	$ 1.10		$ 1.00	$ 2.10	$ 1.74
Diluted earnings per common share	$ 1.08		$ 0.98	$ 2.07	$ 1.70
Ninetieth Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	2.0	[1],[2]
Seventy Fifth Percentile Or Above [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	1.5	[1],[2]
Fiftieth Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	1.0	[1],[2]
Thirty Fifth Percentile Or Below [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	0	[1],[2]
Eighth Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	2.0	[1],[2]
Six And Seven Tenths Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	1.5	[1],[2]
Four And Four Tenths Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	1.0	[1],[2]
Three And Three Tenths Percentile [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common Shares Received For Each Restricted Stock Unit	0	[1],[2]
Restricted Stock Units [Member]
Schedule Of Performance Based Restricted Shares [Line Items]
Shares excluded from potential dilutive shares	0		1,477	0	0
Restricted Stock Awards [Member]
Schedule Of Performance Based Restricted Shares [Line Items]
Shares excluded from potential dilutive shares	0		0	0	3,877
Out Of The Money Stock Options [Member]
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	0		0	0	0
Employee Stock Option [Member]
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	0		0	0	0
Restricted Stock
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	1,137,593		1,006,657	1,206,873	1,098,081
San Diego Gas and Electric Company and Subsidiary [Member]
Earnings Per Share Numerator [Abstract]
Earnings	123		66	222	158
Southern California Gas Company [Member]
Earnings Per Share Numerator [Abstract]
Earnings	$ 81		$ 119	$ 159	$ 165

[1] If performance falls between the tiers shown above, we calculate the payout using linear interpolation.

[2] Participants also receive additional shares for dividend equivalents on shares subject to RSUs, which are deemed reinvested to purchase additional units that become subject to the same vesting conditions as the RSUs to which the dividends relate.