Debt and Credit Agreements	3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements Long-Term Debt In January 2018, Edison International Parent borrowed $500 million under a Term Loan Agreement due in January 2019, with a variable interest rate based on the London Interbank Offered Rate plus 60 basis points. The proceeds were used to repay Edison International Parent's commercial paper borrowings. In March 2018, Edison International Parent issued $550 million of 4.125% senior notes due 2028. The proceeds from the March 2018 issuance were used to repay the $500 million Term Loan discussed above and for general corporate purposes. In March 2018, SCE issued $450 million of 2.90% first and refunding mortgage bonds due 2021, $400 million of 3.65% first and refunding mortgage bonds due 2028 and $400 million of 4.125% first and refunding mortgage bonds due 2048. The proceeds from these bonds were used to repay commercial paper borrowings and for general corporate purposes. Credit Agreements and Short-Term Debt SCE and Edison International Parent have multi-year revolving credit facilities of $2.75 billion and $1.25 billion, respectively, both maturing in July 2022. 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, 2018, SCE's outstanding commercial paper, net of discount, was $70 million at a weighted-average interest rate of 2.24%. At March 31, 2018, letters of credit issued under SCE's credit facility aggregated $103 million and are scheduled to expire in twelve months or less. At December 31, 2017, the outstanding commercial paper, net of discount, was $738 million at a weighted-average interest rate of 1.75%. In December 2017, SCE borrowed $500 million from the credit facility. The interest rate on this loan was 2.46% on December 31, 2017. In January 2018, SCE repaid its $500 million borrowings with cash on hand. At March 31, 2018, Edison International Parent had no outstanding commercial paper. At December 31, 2017, the outstanding commercial paper, net of discount, was $639 million at a weighted-average interest rate of 1.70%. In December 2017, Edison International borrowed $500 million from the credit facility. The interest rate on this loan was 2.56% on December 31, 2017. In January 2018, Edison International repaid its $500 million borrowings with cash on hand.

Debt and Credit Agreements

Long-Term Debt

In January 2018, Edison International Parent borrowed $500 million under a Term Loan Agreement due in January 2019, with a variable interest rate based on the London Interbank Offered Rate plus 60 basis points. The proceeds were used to repay Edison International Parent's commercial paper borrowings. In March 2018, Edison International Parent issued $550 million of 4.125% senior notes due 2028. The proceeds from the March 2018 issuance were used to repay the $500 million Term Loan discussed above and for general corporate purposes.

In March 2018, SCE issued $450 million of 2.90% first and refunding mortgage bonds due 2021, $400 million of 3.65% first and refunding mortgage bonds due 2028 and $400 million of 4.125% first and refunding mortgage bonds due 2048. The proceeds from these bonds were used to repay commercial paper borrowings and for general corporate purposes.

Credit Agreements and Short-Term Debt

SCE and Edison International Parent have multi-year revolving credit facilities of $2.75 billion and $1.25 billion, respectively, both maturing in July 2022. 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, 2018, SCE's outstanding commercial paper, net of discount, was $70 million at a weighted-average interest rate of 2.24%. At March 31, 2018, letters of credit issued under SCE's credit facility aggregated $103 million and are scheduled to expire in twelve months or less. At December 31, 2017, the outstanding commercial paper, net of discount, was $738 million at a weighted-average interest rate of 1.75%. In December 2017, SCE borrowed $500 million from the credit facility. The interest rate on this loan was 2.46% on December 31, 2017. In January 2018, SCE repaid its $500 million borrowings with cash on hand.

At March 31, 2018, Edison International Parent had no outstanding commercial paper. At December 31, 2017, the outstanding commercial paper, net of discount, was $639 million at a weighted-average interest rate of 1.70%. In December 2017, Edison International borrowed $500 million from the credit facility. The interest rate on this loan was 2.56% on December 31, 2017. In January 2018, Edison International repaid its $500 million borrowings with cash on hand.