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OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Operating expenses          
Cost Of Electric Fuel And Purchased Power From Utilities $ 498 $ 571 $ 979 $ 1,081  
Other operation and maintenance 713 729 1,371 1,405  
Depreciation and amortization 307 288 610 574  
Other income (expense), net 37 49 76 89  
Interest expense 139 138 273 274  
Net income 320 292 778 558  
Earnings attributable to noncontrolling interest (24) (22) (45) (41)  
Earnings attributable to common shares 295 269 732 516  
Otay Mesa VIE [Member]          
Operating expenses          
Cost Of Electric Fuel And Purchased Power From Utilities (21) (22) (39) (40)  
Other operation and maintenance 6 5 10 10  
Depreciation and amortization 6 7 12 14  
Operating Expenses (9) (10) (17) (16)  
Utility operating income 9 10 17 16  
Interest expense (5) (4) (9) (8)  
Net income 4 6 8 8  
Earnings attributable to noncontrolling interest (4) (6) (8) (8)  
Earnings attributable to common shares 0 $ 0 0 $ 0  
Equity of variable interest entity 61   61   $ 60
Secured debt of variable interest entity 320   320    
Cameron LNG Holdings [Member]          
Schedule Of Equity Method And Other Investments [Line Items]          
Equity Method And Other Investments $ 1,043   $ 1,043   $ 1,007