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Related Party Transactions | 12 Months Ended
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Dec. 31, 2018
Related Party Transactions [Abstract] |
Related Party Transactions | Related-Party Transactions Edison International and SCE provide and receive various services to and from its subsidiaries and affiliates. Services provided to Edison International by SCE are priced at fully loaded cost (i.e., direct cost of good or service and allocation of overhead cost). Specified administrative services such as payroll, employee benefit programs, all performed by Edison International or SCE employees, are shared among all affiliates of Edison International. Costs are allocated based on one of the following formulas: percentage of time worked, equity in investment and advances, number of employees, or multi-factor (operating revenue, operating expenses, total assets and number of employees). Edison International allocates various corporate administrative and general costs to SCE and other subsidiaries using established allocation factors. For the years ended December 31, 2018 and 2017, SCE purchased wildfire liability insurance for premiums of $22 million and $144 million, respectively, from Edison Insurance Services, Inc. ("EIS"), a wholly-owned subsidiary of Edison International. EIS fully reinsured the exposure for these policies through the commercial reinsurance market, with reinsurance limits and premiums equal to those of the insurance purchased by SCE. The related-party transactions included in SCE's consolidated balance sheets for wildfire-related insurance purchased from EIS were as follows:
|  | December 31,
(in millions) |  | 2018 |  | 2017
Long-term insurance receivable due from affiliate |  | $ | 1,000 |  |  | $ | — |
Prepaid insurance 1 |  | 13 |  |  | 131 |
Current payables due to affiliate 2 |  | 4 |  |  | 3 |
1 Reflected in "Prepaid expenses" on SCE's consolidated balance sheets. The amortization expense for prepaid insurance were $140 million and $13 million for the years ended December 31, 2018 and 2017, respectively. 2 Reflected in "Accounts payable" on SCE's consolidated balance sheets.

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- Definition The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -URI http://asc.fasb.org/topic&trid=2122745 + Details
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