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Related-Party Transactions
 9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]  
Related-Party Transactions Related-Party Transactions
For the three months ended September 30, 2019, SCE did not purchase wildfire liability insurance from Edison Insurance Services, Inc. ("EIS"), a wholly-owned subsidiary of Edison International. For the nine months ended September 30, 2019, SCE purchased wildfire liability insurance with premiums of $260 million. The related-party transactions included in SCE's consolidated balance sheets for wildfire-related insurance purchased from EIS were as follows:

(in millions)
 
September 30,
2019
 
December 31, 2018
Long-term insurance receivable due from affiliate
 
$
1,000

 
$
1,000

Prepaid insurance1
 
42

 
13

Current payables due to affiliate2
 
—

 
4

1 Reflected in "Prepaid expenses" on SCE's consolidated balance sheets.
2 Reflected in "Accounts payable" on SCE's consolidated balance sheets.
The amortization expense for wildfire-related insurance was $51 million and $35 million for the three months ended September 30, 2019 and 2018 respectively, and $123 million and $106 million for the nine months ended September 30, 2019 and 2018, respectively.