Debt and Credit Agreements	3 Months Ended
Debt and Credit Agreements	Mar. 31, 2020
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements Long-Term Debt In January 2020, SCE issued $100 million of 2.85% first and refunding mortgage bonds due in 2029 and $500 million of 3.65% first and refunding mortgage bonds due in 2050. The proceeds were used to repay SCE's commercial paper borrowings and for general corporate purposes. In March 2020, SCE issued $400 million of 2.25% first and refunding mortgage bonds due in 2030 and $700 million of 3.65% first and refunding mortgage bonds due in 2050. The proceeds were primarily used to repay SCE's commercial paper borrowings and for general corporate purposes, including the re-purchase of SCE tax exempt pollution control bonds. Credit Agreements and Short-Term Debt In March 2020, SCE borrowed $475 million under a term loan agreement due in March 2021, with a variable interest rate based on the London Interbank Offered Rate plus 60 basis points. The proceeds were used to repay commercial paper borrowings temporarily used to fund AB 1054 Excluded Capital Expenditures. Additionally, in March 2020, SCE entered into a revolving credit facility in an amount not to exceed $800 million with a variable interest rate based on the London Interbank Offered Rate plus 65 basis points on drawn funds. The credit facility is available for borrowing needs until March 2021, and may be extended for two, 364-day periods, at the lenders' discretion. The aggregate maximum principal amount under the revolving credit facility may be increased up to $1.1 billion, provided that additional lender commitments are obtained. As of March 31, 2020, there were no amounts drawn against the revolving credit facility. SCE plans to use the proceeds to finance future AB 1054 Excluded Capital Expenditures. SCE and Edison International Parent have multi-year revolving credit facilities of $3.0 billion and $1.5 billion, respectively, both maturing in May 2024, with an option to extend for an additional year, which may be exercised upon agreement between SCE or Edison International Parent and their respective lenders. The aggregate maximum principal amount under the SCE and Edison International Parent revolving credit facilities may be increased up to $4.0 billion and $2.0 billion, respectively, provided that additional lender commitments are obtained. SCE's credit facility is generally used to support commercial paper borrowings and letters of credit issued for procurement-related collateral requirements, balancing account undercollections and for general corporate purposes, including working capital requirements to support operations and capital expenditures. Edison International Parent's credit facility is used to support commercial paper borrowings and for general corporate purposes. At March 31, 2020, SCE had no outstanding commercial paper. At December 31, 2019, SCE had $550 million outstanding commercial paper, net of discount, at a weighted-average interest rate of 2.24%. At March 31, 2020 and December 31, 2019, letters of credit issued under SCE's credit facility aggregated $175 million and $152 million, respectively, substantially all of which are scheduled to expire in twelve months or less. Edison International Parent had no outstanding commercial paper at both March 31, 2020 and December 31, 2019. In March 2020, Edison International Parent borrowed $800 million under a term loan agreement due in March 2021 with a variable interest rate based on the London Interbank Offered Rate plus 1.125%. The proceeds were used for general corporate purposes. Financing Subsequent to March 31, 2020 In April 2020, SCE issued $600 million of 3.70% first and refunding mortgage bonds due in 2025. The proceeds were used to finance undercollections of revenues that SCE is authorized to recover from customers through regulatory balancing accounts. In April 2020, SCE purchased $373 million of its tax-exempt pollution control bonds that were subject to re-marketing and also converted these bonds to a variable rate structure. SCE is the holder of these bonds and plans to re-market them subject to market conditions. In April 2020, Edison International Parent issued $400 million of 4.95% senior notes due 2025. The proceeds were used to repay all $400 million of Edison International Parent's outstanding 2.125% Senior Notes due in 2020.