Debt and Equity Financing	9 Months Ended
Debt and Equity Financing	Sep. 30, 2019
Debt Disclosure [Abstract]
Debt and Equity Financing	Debt and Equity Financing Long-Term Debt During the first quarter of 2019, SCE issued $500 million of 4.20% first and refunding mortgage bonds due in 2029 and $600 million of 4.875% first and refunding mortgage bonds due in 2049. The proceeds were used to repay commercial paper borrowings and for general corporate purposes. During the second quarter of 2019, Edison International Parent issued $600 million of 5.75% senior notes due June 15, 2027. Of the proceeds of the senior note offering, $450 million was contributed to SCE with the remainder used for general corporate and working capital purposes. In August 2019, SCE issued $400 million of 2.85% first and refunding mortgage bonds due in 2029 and $800 million of 4.00% first and refunding mortgage bonds due in 2047. The proceeds, along with proceeds from the equity issuance described below, were used to make SCE's initial contribution to the Wildfire Insurance Fund of $2.4 billion in September 2019. For further information, see "— Equity". Credit Agreements and Short-Term Debt In February 2019, SCE borrowed $750 million under a Term Loan Agreement due in February 2020, with a variable interest rate based on the London Interbank Offered Rate plus 70 basis points. The proceeds were used to repay SCE's commercial paper borrowings and for general corporate purposes. In April 2019, Edison International Parent borrowed $1.0 billion under a Term Loan Agreement due in April 2020, with a variable interest rate based on the London Interbank Offered Rate plus 90 basis points. Of the proceeds of the term loan, $750 million was contributed to SCE with the remainder used for general corporate and working capital purposes. SCE used the $750 million contribution to repay its February 2019 Term Loan discussed above. In June 2019, SCE and Edison International Parent amended the maturity date of their multi-year revolving credit facilities of $3.0 billion and $1.5 billion, respectively. The facilities now mature 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. 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 September 30, 2019, SCE had no outstanding commercial paper. At September 30, 2019, letters of credit issued under SCE's credit facility aggregated $222 million, substantially all of which are scheduled to expire in twelve months or less. At December 31, 2018, the outstanding commercial paper, net of discount, was $720 million at a weighted-average interest rate of 3.23%. Edison International Parent had no outstanding commercial paper at both September 30, 2019 and December 31, 2018. Equity In May 2019, Edison International filed a prospectus supplement and executed several distribution agreements with certain sales agents to establish an "at-the-market" ("ATM") program under which it may sell shares of its common stock having an aggregate sales price of up to $1.5 billion. As of September 30, 2019, no sales had occurred and Edison International has no obligation to sell the shares available under the ATM program. In June 2019, SCE received a $450 million capital contribution from Edison International Parent to repay commercial paper borrowings and for general corporate purposes. In July 2019, Edison International issued approximately $2.2 billion of common stock in an underwritten offering. Of the proceeds, $1.2 billion was contributed to SCE, which SCE used, along with the long-term debt issuance described above, to make its $2.4 billion initial contribution to the Wildfire Insurance Fund in September 2019. In August 2019 and September 2019, SCE received capital contributions of $200 million and $450 million, respectively, for general corporate purposes. The remaining $350 million will be used for general corporate purposes. For further information, see "— Long-Term Debt".