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Debt and Credit Agreements (Credit Facilities) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
Line of Credit Facility  
Commitment $ 4,850
Outstanding borrowings 568
Outstanding letters of credit 21
Amount available 4,261
Edison International Parent and Other | Multi-year credit facilities  
Line of Credit Facility  
Commitment 1,500
Outstanding borrowings 20
Amount available 1,480
Contingent maximum available borrowing $ 2,000
Edison International Parent and Other | Multi-year credit facilities | Secured Overnight Financing Rate ("SOFR")  
Line of Credit Facility  
Variable rate on debt (as a percent) 1.28%
Edison International Parent and Other | Multi-year credit facilities | Commercial paper  
Line of Credit Facility  
Outstanding borrowings $ 20
Weighted average interest rate (as a percent) 5.00%
SCE | Multi-year credit facilities  
Line of Credit Facility  
Commitment $ 3,350
Outstanding borrowings 548
Outstanding letters of credit 21
Amount available 2,781
Contingent maximum available borrowing $ 4,000
SCE | Multi-year credit facilities | Secured Overnight Financing Rate ("SOFR")  
Line of Credit Facility  
Variable rate on debt (as a percent) 1.08%
SCE | Multi-year credit facilities | Commercial paper  
Line of Credit Facility  
Outstanding borrowings $ 548
Weighted average interest rate (as a percent) 5.25%
SCE | Standby letters of credit  
Line of Credit Facility  
Commitment $ 625
Outstanding letters of credit 196
Amount available $ 429