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Revenue (Receivables, Accrued Unbilled Revenue and Contract Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Receivables: |  |
Billed revenue | $ 907 | $ 613
Accrued unbilled revenues | 505 | 212
Total receivables | 1,412 | 825
Southern California Edison |  |
Receivables: |  |
Contract liabilities | $ 22 | $ 20

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