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Debt and Credit Agreements (Long-term debt maturities) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 481
2019 81
2020 481
2021 580
2022 777
SCE  
Debt Instrument [Line Items]  
2018 479
2019 79
2020 79
2021 579
2022 $ 364