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Notes Receivable
 12 Months Ended
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Notes Receivable
Notes Receivable
Notes receivable consist of fixed and variable rate notes related primarily to amounts owed to the Company from transmission owners for certain projects for the financing of network upgrades. The Company's notes receivable were as follows:
 
As of December 31,
 
2017
 
2016
 
(In millions)
Notes receivable
$
16

 
$
34

Less current maturities(a)
14

 
18

Total notes receivable — non-current
$
2

 
$
16


(a)
The current portion of notes receivable is recorded in prepayments and other current assets on the consolidated balance sheets.