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EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE (Tables)
3 Months Ended
Mar. 31, 2012
Effective Of Change In Accounting Principle Tables [Abstract]  
Schedule Of Effective Change In Accounting Principle [Text Block]
EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE      
(Dollars in millions, except per share amounts)      
  Three months ended March 31, 2011
   As    
   Originally   Retrospectively
Sempra Energy Consolidated Reported Adjustments Adjusted
CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS      
Depreciation and amortization$231$(1)$230
Income before income taxes and equity earnings      
of certain unconsolidated subsidiaries 342 1 343
Income tax expense 109 5 114
Net income 264 (4) 260
Earnings 258 (4) 254
        
Basic earnings per common share$1.07$(0.01)$1.06
Diluted earnings per common share$1.07$(0.02)$1.05
        
CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS      
Net income$264$(4)$260
Adjustments to reconcile net income to net cash provided by      
operating activities:      
Depreciation and amortization 231 (1) 230
Deferred income taxes and investment tax credits 88 (6) 82
Net change in other working capital components (income taxes) 286 11 297
        
  As of December 31, 2011
   As    
   Originally   Retrospectively
   Reported Adjustments Adjusted
CONDENSED CONSOLIDATED BALANCE SHEET      
Property, plant and equipment$31,303$(111)$31,192
Less accumulated depreciation and amortization (7,731) 4 (7,727)
Property, plant and equipment, net$23,572$(107)$23,465
        
Income taxes payable$16$(11)$5
Deferred income taxes, noncurrent liability 1,554 (34) 1,520
Deferred credits and other 783 1 784
Retained earnings(1) 8,225 (63) 8,162
(1)Adjustment includes the cumulative effect of the change in accounting principle of reductions in net income and earnings of $26 million, $30 million, a negligible amount, and $7 million for the years ended December 31, 2011, 2010, 2009 and 2008, respectively.