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Fair Value Measurements - Schedule of Fair Value by Level within the Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets at fair value    
Nuclear decommissioning trusts $ 4,475 $ 4,286
SCE    
Assets at fair value    
Nuclear decommissioning trusts $ 4,475 $ 4,286
Liabilities at fair value    
Percentage of equity investments located in the United States (as a percent) 72.00% 75.00%
Collateralized mortgage obligations and other asset backed securities $ 61 $ 94
Receivable (payables), net, related to investments (216) (105)
SCE | Fair Value, Recurring    
Assets at fair value    
Derivative contracts, netting and collateral (3) (1)
Derivative contracts, total 137 212
Money market funds and other 34 22
Nuclear decommissioning trusts 4,691 4,391
Total assets 4,862 4,625
Liabilities at fair value    
Derivative contracts, netting and collateral (86) (47)
Derivative contracts, total 0 0
Total liabilities 0 0
Net assets 4,862 4,625
Net assets , netting and collateral 83 46
SCE | Fair Value, Recurring | Level 1    
Assets at fair value    
Derivative contracts 0 0
Money market funds and other 12 0
Nuclear decommissioning trusts 2,984 2,734
Total assets 2,996 2,734
Liabilities at fair value    
Derivative contracts 0 0
Total liabilities 0 0
Net assets 2,996 2,734
SCE | Fair Value, Recurring | Level 2    
Assets at fair value    
Derivative contracts 0 1
Money market funds and other 22 22
Nuclear decommissioning trusts 1,707 1,657
Total assets 1,729 1,680
Liabilities at fair value    
Derivative contracts 83 47
Total liabilities 83 47
Net assets 1,646 1,633
SCE | Fair Value, Recurring | Level 3    
Assets at fair value    
Derivative contracts 140 212
Money market funds and other 0 0
Nuclear decommissioning trusts 0 0
Total assets 140 212
Liabilities at fair value    
Derivative contracts 3 0
Total liabilities 3 0
Net assets 137 212
SCE | Fair Value, Recurring | Stocks    
Assets at fair value    
Nuclear decommissioning trusts 1,834 1,631
SCE | Fair Value, Recurring | Stocks | Level 1    
Assets at fair value    
Nuclear decommissioning trusts 1,834 1,631
SCE | Fair Value, Recurring | Stocks | Level 2    
Assets at fair value    
Nuclear decommissioning trusts 0 0
SCE | Fair Value, Recurring | Stocks | Level 3    
Assets at fair value    
Nuclear decommissioning trusts 0 0
SCE | Fair Value, Recurring | Fixed Income    
Assets at fair value    
Nuclear decommissioning trusts 2,693 2,593
SCE | Fair Value, Recurring | Fixed Income | Level 1    
Assets at fair value    
Nuclear decommissioning trusts 1,017 975
SCE | Fair Value, Recurring | Fixed Income | Level 2    
Assets at fair value    
Nuclear decommissioning trusts 1,676 1,618
SCE | Fair Value, Recurring | Fixed Income | Level 3    
Assets at fair value    
Nuclear decommissioning trusts 0 0
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents    
Assets at fair value    
Nuclear decommissioning trusts 164 167
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 1    
Assets at fair value    
Nuclear decommissioning trusts 133 128
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 2    
Assets at fair value    
Nuclear decommissioning trusts 31 39
SCE | Fair Value, Recurring | Short-term investments, primarily cash equivalents | Level 3    
Assets at fair value    
Nuclear decommissioning trusts $ 0 $ 0