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OTHER FINANCIAL DATA - COMPREHENSIVE INCOME AND EQUITY (Details)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2013
MXN
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Bay Gas Storage Company [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Bay Gas Storage Company [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Southern Gas Transmission [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Southern Gas Transmission [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Liberty Gas Storage [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Liberty Gas Storage [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Tecsur [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Tecsur [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Luz Del Sur [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Luz Del Sur [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Chilquinta Energia [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Chilquinta Energia [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others, Otay Mesa VIE [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others, Otay Mesa VIE [Member]
USD ($)
Jun. 30, 2014
Ownership Interests Held By Others IEnova [Member]
USD ($)
Dec. 31, 2013
Ownership Interests Held By Others IEnova [Member]
USD ($)
Jun. 30, 2014
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2013
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2014
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2013
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2014
Southern California Gas Company [Member]
USD ($)
Jun. 30, 2013
Southern California Gas Company [Member]
USD ($)
Jun. 30, 2014
Southern California Gas Company [Member]
USD ($)
Jun. 30, 2013
Southern California Gas Company [Member]
USD ($)
Jun. 30, 2014
Total Shareholders' Equity
USD ($)
Jun. 30, 2013
Total Shareholders' Equity
USD ($)
Jun. 30, 2014
Total Shareholders' Equity
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2013
Total Shareholders' Equity
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2014
Noncontrolling Interests [Member]
USD ($)
Jun. 30, 2013
Noncontrolling Interests [Member]
USD ($)
Jun. 30, 2014
Noncontrolling Interests [Member]
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Jun. 30, 2013
Noncontrolling Interests [Member]
San Diego Gas and Electric Company and Subsidiary [Member]
USD ($)
Comprehensive Income Disclosure [Line Items]                                                                              
Equity, beginning of period         $ 11,850 [1] $ 10,683                                       $ 4,719 [1] $ 4,298     $ 2,549 [1] $ 2,235 $ 11,008 $ 10,282 $ 4,628 $ 4,222 $ 842 $ 401 $ 91 $ 76
Comprehensive income (loss)         511 596                                       230 170     159 166 472 583 223 159 39 13 7 11
Share-based compensation expense         21 20                                                   21 20     0 0    
Common stock dividends declared         (324) (307)                                                 (50) (324) (307)     0 0    
Preferred dividend requirements                                               0 (1) 0 (2) (1) (1) (1) (1)       (2)       0
Preferred dividends of subsidiaries     (1) (1) (1) (3)                                                   (1) (3)     0 0    
Issuance of common stock         42 22                                                   42 22     0 0    
Tax benefit related to share-based compensation         13 17                                                   13 17     0 0    
Repurchases of common stock         (37) (45)                                                   (37) (45)     0 0    
Sale of noncontrolling interests, net of offering costs           574                                                     135       439    
Noncontrolling Interest Increase         1 4                                         4         0 0   0 1 4   4
Distributions to noncontrolling interests         (25) (13)                                       (13) (3)         0 0 0 0 (25) (13) (13) (3)
Equity, end of period     12,051 11,548 12,051 11,548                                   4,936 4,467 4,936 4,467 2,707 2,350 2,707 2,350 11,194 10,704 4,851 4,379 857 844 85 88
Ownership Interests Held By Others [Line Items]                                                                              
Percent of ownership held by others               9.10%   49.00%   25.00%   9.80%   20.20%       100.00%   18.90%                                  
Percent of ownership held by others, minimum                                   24.40% [2]                                          
Percent of ownership held by others, maximum                                   43.40% [2]                                          
Amount of ownership interests held by others     837   837   822 23 22 1 1 14 14 3 3 225 222 25 [2] 27 [2] 85 91 461 442                                
Sale Of Noncontrolling Interests [Abstract]                                                                              
Proceeds From Sale Of Noncontrolling Interests Net $ 574 7,100     $ 0 $ 574                                                                  
[1] Derived from audited financial statements.
[2] Chilquinta Energía has four subsidiaries with noncontrolling interests held by others. Percentage range reflects the highest and lowest ownership percentages amongst these subsidiaries.