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EMPLOYEE BENEFIT PLANS - FAIR VALUE MEASUREMENTS, INVESTMENT ASSETS OF PENSION PLANS (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2,664 $ 2,390 $ 3,182
Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 726 670 859
Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,744 1,535 2,095
Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 194 185  
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,169 1,096 1,408
Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 150 147 197
Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 990 923 $ 1,178
Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 29 26  
Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 426 385  
Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 955 892  
Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 118 108  
Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103 96  
Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 286 306  
Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 15 13  
Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 77 68  
Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 262 267  
Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18 15  
Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 9  
Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 463 400  
Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 4  
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 503 453  
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,217 1,159  
Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 136 123  
Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 110 105  
Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 749 706  
Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21 17  
Cash and cash equivalents | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 3  
Cash and cash equivalents | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 6  
Cash and cash equivalents | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 1  
Cash and cash equivalents | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 1  
Cash and cash equivalents | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 3  
Cash and cash equivalents | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 6  
Cash and cash equivalents | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 1  
Cash and cash equivalents | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 1  
Cash and cash equivalents | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and cash equivalents | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and cash equivalents | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash and cash equivalents | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Domestic | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103 80  
Equity Securities, Domestic | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 354 313  
Equity Securities, Domestic | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23 17  
Equity Securities, Domestic | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 10  
Equity Securities, Domestic | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 57 46  
Equity Securities, Domestic | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 6  
Equity Securities, Domestic | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103 79  
Equity Securities, Domestic | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 353 311  
Equity Securities, Domestic | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22 17  
Equity Securities, Domestic | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 10  
Equity Securities, Domestic | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 57 46  
Equity Securities, Domestic | Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 6  
Equity Securities, Domestic | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Equity Securities, Domestic | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
Equity Securities, Domestic | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 0  
Equity Securities, Domestic | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Domestic | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Domestic | Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, International | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 40  
Equity Securities, International | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 137 158  
Equity Securities, International | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 9  
Equity Securities, International | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 5  
Equity Securities, International | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22 24  
Equity Securities, International | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 3  
Equity Securities, International | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40 40  
Equity Securities, International | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 137 158  
Equity Securities, International | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 9  
Equity Securities, International | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 5  
Equity Securities, International | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22 24  
Equity Securities, International | Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 3  
Equity Securities, International | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, International | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, International | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, International | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, International | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, International | Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Registered Investment Company Domestic | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 41 37  
Equity Securities, Registered Investment Company Domestic | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 142 144  
Equity Securities, Registered Investment Company Domestic | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 7  
Equity Securities, Registered Investment Company Domestic | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71 65  
Equity Securities, Registered Investment Company Domestic | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 181 152  
Equity Securities, Registered Investment Company Domestic | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 2  
Equity Securities, Registered Investment Company Domestic | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 41 35  
Equity Securities, Registered Investment Company Domestic | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 141 137  
Equity Securities, Registered Investment Company Domestic | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 7  
Equity Securities, Registered Investment Company Domestic | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 71 65  
Equity Securities, Registered Investment Company Domestic | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 78 80  
Equity Securities, Registered Investment Company Domestic | Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 2  
Equity Securities, Registered Investment Company Domestic | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 2  
Equity Securities, Registered Investment Company Domestic | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 7  
Equity Securities, Registered Investment Company Domestic | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Registered Investment Company Domestic | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Registered Investment Company Domestic | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 103 72  
Equity Securities, Registered Investment Company Domestic | Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Registered Investment Company International | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   5  
Equity Securities, Registered Investment Company International | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   20  
Equity Securities, Registered Investment Company International | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   2  
Equity Securities, Registered Investment Company International | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 7  
Equity Securities, Registered Investment Company International | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   3  
Equity Securities, Registered Investment Company International | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   5  
Equity Securities, Registered Investment Company International | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   20  
Equity Securities, Registered Investment Company International | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   2  
Equity Securities, Registered Investment Company International | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 7  
Equity Securities, Registered Investment Company International | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   3  
Equity Securities, Registered Investment Company International | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Equity Securities, Registered Investment Company International | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Equity Securities, Registered Investment Company International | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Equity Securities, Registered Investment Company International | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Equity Securities, Registered Investment Company International | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Domestic government and government agencies | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 245 227  
Domestic government and government agencies | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 326 278  
Domestic government and government agencies | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 80 75  
Domestic government and government agencies | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 11  
Domestic government and government agencies | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 142 165  
Domestic government and government agencies | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 2  
Domestic government and government agencies | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 240 224  
Domestic government and government agencies | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 310 261  
Domestic government and government agencies | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 78 72  
Domestic government and government agencies | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12 9  
Domestic government and government agencies | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 128 151  
Domestic government and government agencies | Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Domestic government and government agencies | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 3  
Domestic government and government agencies | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16 17  
Domestic government and government agencies | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 3  
Domestic government and government agencies | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
Domestic government and government agencies | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14 14  
Domestic government and government agencies | Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 0  
International government bonds | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
International government bonds | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 6  
International government bonds | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 9  
International government bonds | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International government bonds | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International government bonds | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
International government bonds | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
International government bonds | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 6  
International government bonds | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 9 8  
Domestic corporate bonds | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 62 52  
Domestic corporate bonds | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 212 204  
Domestic corporate bonds | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 11  
Domestic corporate bonds | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 6  
Domestic corporate bonds | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 295 269  
Domestic corporate bonds | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 4  
Domestic corporate bonds | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Domestic corporate bonds | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Domestic corporate bonds | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Domestic corporate bonds | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Domestic corporate bonds | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Domestic corporate bonds | Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Domestic corporate bonds | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 62 52  
Domestic corporate bonds | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 212 204  
Domestic corporate bonds | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 11  
Domestic corporate bonds | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 6  
Domestic corporate bonds | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 295 269  
Domestic corporate bonds | Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 4  
International corporate bonds | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 8  
International corporate bonds | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27 30  
International corporate bonds | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 1  
International corporate bonds | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
International corporate bonds | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42 37  
International corporate bonds | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
International corporate bonds | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International corporate bonds | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International corporate bonds | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International corporate bonds | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International corporate bonds | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International corporate bonds | Level 1 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
International corporate bonds | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 8  
International corporate bonds | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27 30  
International corporate bonds | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 1  
International corporate bonds | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
International corporate bonds | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42 37  
International corporate bonds | Level 2 | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Other | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Other | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   (1)  
Other | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   1  
Derivative financial instruments | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (15) (1)  
Derivative financial instruments | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11    
Derivative financial instruments | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (5)    
Derivative financial instruments | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2    
Derivative financial instruments | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (6)    
Derivative financial instruments | Level 1 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (15) (1)  
Derivative financial instruments | Level 1 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11    
Derivative financial instruments | Level 1 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (5)    
Derivative financial instruments | Level 1 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2    
Derivative financial instruments | Level 1 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (6)    
Derivative financial instruments | Level 2 | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Derivative financial instruments | Level 2 | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Derivative financial instruments | Level 2 | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Derivative financial instruments | Level 2 | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Derivative financial instruments | Level 2 | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
Accounts receivable/payable, net | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 (1)  
Accounts receivable/payable, net | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (12) (7)  
Accounts receivable/payable, net | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (2)    
Accounts receivable/payable, net | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 (4)  
Common/collective trusts | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 214 210  
Common/collective trusts | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 513 355  
Common/collective trusts | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 56 60  
Common/collective trusts | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10 42  
Common/collective trusts | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 233 218  
Common/collective trusts | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 7  
Other | Pension Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 8  
Other | Pension Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26 28  
Other | Pension Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
Other | Other Postretirement Benefits Plan | SDG&E      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 32    
Other | Other Postretirement Benefits Plan | SoCalGas      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 3  
Other | Other Postretirement Benefits Plan | Other Sempra      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 2  
Total Sempra investment assets in the fair value hierarchy | Level 1 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,499 1,385  
Total Sempra investment assets in the fair value hierarchy | Level 1 | Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 404 415  
Total Sempra investment assets in the fair value hierarchy | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 357 350  
Total Sempra investment assets in the fair value hierarchy | Level 2 | Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 476 $ 413