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DEBT AND CREDIT FACILITIES - LONG TERM DEBT (Details) - USD ($)
1 Months Ended
Sep. 30, 2016
Oct. 04, 2016
Sep. 26, 2016
Sep. 12, 2016
Jul. 31, 2016
Jun. 30, 2016
May 31, 2016
South American Utilities [Member] | Corporate bonds maturing 2025 [Member]              
Debt Instrument [Line Items]              
Debt amount offered and sold         $ 50,000,000    
Stated rate of debt offered and sold         6.50%    
Sempra Mexico [Member] | GdC [Member]              
Debt Instrument [Line Items]              
Long-term debt assumed     $ 315,000,000        
Current portion of long-term debt     $ 49,000,000        
Sempra Natural Gas [Member] | Energy South [Member] | Disposed of by Sale [Member]              
Debt Instrument [Line Items]              
Cash proceeds on sale       $ 318,000,000      
Cash sold       2,000,000      
Debt assumed by buyer       $ 67,000,000      
Sempra Natural Gas [Member] | Energy South [Member] | Disposed of by Sale [Member] | Mobile Gas [Member] | 4.14% first mortgage bonds [Member]              
Debt Instrument [Line Items]              
Stated rate of debt offered and sold       4.14%      
Debt assumed by buyer       $ 20,000,000      
Sempra Natural Gas [Member] | Energy South [Member] | Disposed of by Sale [Member] | Mobile Gas [Member] | 5% first mortgage bonds [Member]              
Debt Instrument [Line Items]              
Stated rate of debt offered and sold       5.00%      
Debt assumed by buyer       $ 42,000,000      
Sempra Natural Gas [Member] | Energy South [Member] | Disposed of by Sale [Member] | Willmut Gas [Member] | 3.1% notes payable [Member]              
Debt Instrument [Line Items]              
Stated rate of debt offered and sold       3.10%      
Debt assumed by buyer       $ 5,000,000      
San Diego Gas and Electric Company [Member] | First mortgage bonds maturing 2026 [Member]              
Debt Instrument [Line Items]              
Debt amount offered and sold             $ 500,000,000
Stated rate of debt offered and sold             2.50%
San Diego Gas and Electric Company [Member] | Other long term debt variable rate due 2027 [Member]              
Debt Instrument [Line Items]              
Stated rate of debt offered and sold             5.00%
Amount of debt redeemed early             $ 105,000,000
Southern California Gas Company [Member] | First mortgage bonds maturing 2026 [Member]              
Debt Instrument [Line Items]              
Debt amount offered and sold           $ 500,000,000  
Stated rate of debt offered and sold           2.60%  
IEnova [Member] | Sempra Mexico [Member] | GdC [Member]              
Debt Instrument [Line Items]              
Ownership percentage acquired     50.00%        
Long-term debt assumed $ 364,000,000            
Current portion of long-term debt $ 49,000,000            
IEnova [Member] | Sempra Mexico [Member] | GdC [Member] | LIBOR [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Spread on variable rate 2.00%            
IEnova [Member] | Sempra Mexico [Member] | GdC [Member] | LIBOR [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Spread on variable rate 2.75%            
IEnova [Member] | Sempra Mexico [Member] | GdC [Member] | Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Fixed interest rate on floating-to-fixed interest rate swaps 2.63%            
Subsequent Event [Member] | Sempra Energy [Member] | Other long term debt fixed rate due 2019 [Member]              
Debt Instrument [Line Items]              
Debt amount offered and sold   $ 500,000,000          
Stated rate of debt offered and sold   1.625%