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DEBT AND CREDIT FACILITIES (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Line Of Credit Facility, Sempra Energy Consolidated [Member]
Dec. 31, 2010
Line Of Credit Facility, Sempra Energy Consolidated [Member]
Sep. 30, 2011
Line Of Credit Facility, Sempra Energy [Member]
Sep. 30, 2011
Line Of Credit Facility, Sempra Global [Member]
Dec. 31, 2010
Line Of Credit Facility, Sempra Global [Member]
Sep. 30, 2011
Line Of Credit Facility, Sempra Utilities Combined [Member]
Sep. 30, 2011
Line Of Credit Facility, S D G E [Member]
Sep. 30, 2011
Line Of Credit Facility, So Cal Gas [Member]
Sep. 30, 2010
Fowler Ridge I I Wind Farm [Member]
Sep. 30, 2011
Fowler Ridge I I Wind Farm [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2014 Member
Sempra Energy [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2014 Member
Chilquinta Energia [Member]
Sep. 30, 2011
Other Long Term Debt, Floating Rate Due 2014 Member
Sempra Energy [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2011 To 2015 Member
Luz Del Sur [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2012 To 2016 Member
Luz Del Sur [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2030 Member
Chilquinta Energia [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2021 [Member]
San Diego Gas and Electric Company and Subsidiary [Member]
Sep. 30, 2011
Other Long Term Debt, Fixed Rate Due 2021 [Member]
Mobile Gas [Member]
Sep. 30, 2011
Other Long Term Debt, fixed Rate Due 2031 [Member]
Mobile Gas [Member]
Line of Credit Facility [Line Items]                     
Committed lines of credit, maximum borrowing capacity  $ 3,800 $ 1,000$ 2,000 $ 800$ 600$ 600           
Committed lines of credit, maximum ratio of indebtedness to total capitalization    65.00%65.00% 65.00%             
Committed lines of credit, remaining borrowing capacity  2,700     363563           
Committed lines of credit, capacity for issuance of letters of credit    400  200             
Outstanding commercial paper supported by committed lines of credit     823               
Other instruments supported by committed lines of credit    14   237            
Weighted average interest rate on total short-term debt outstanding  0.67%0.46%                 
Commercial paper noncurrent200800   200800              
Guarantees [Abstract]                     
Net trading liabilities of RBS Sempra Commodities supported by Sempra Energy's guarantees15                    
Schedule of Equity Method Investments [Line Items]                     
Ownership percentage in equity method investee           50.00%         
Long-term debt outstanding           348         
Proceeds from return of capital          180          
Liability for guarantee obligation associated with cash flow requirements           9         
Debt Instrument [Line Items]                     
Debt Instrument, Face Amount            500 300168401983502042
Debt Instrument, Interest Rate, Stated Percentage            2.00%2.75%   4.25%3.00%4.14%5.00%
Debt Instrument, Interest Rate At Period End              1.11%      
Debt Instrument Stated Percentage Rate Minimum               5.78%5.45%    
Debt Instrument Stated Percentage Rate Maximum               7.91%6.75%    
Debt Instrument Purchased By Parent             58       
Debt Instrument Net of Intercompany Elimination             $ 23