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COMMITMENTS AND CONTINGENCIES - NUCLEAR FUEL DISPOSAL (Details) - San Diego Gas and Electric Company [Member] - USD ($)
$ in Millions
1 Months Ended
Apr. 18, 2016
May 31, 2017
Feb. 28, 2017
Sep. 30, 2016
May 31, 2016
Total Ownership [Member]          
Jointly Owned Utility Plant Interests [Line Items]          
Spent nuclear fuel damages awarded $ 162   $ 43    
Filed claims amount       $ 56  
SDG&E Ownership [Member]          
Jointly Owned Utility Plant Interests [Line Items]          
Spent nuclear fuel damages awarded   $ 9     $ 32
Decrease In SONGS regulatory asset         23
Decrease In nuclear decommissioning balancing account         8
Decrease In operation and maintenance cost balancing account         $ 1