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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Schedule of Related-Party Transactions
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 insurance1
 
13

 
131

Current payables due to affiliate2
 
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.