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Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Long-term debt issuances and borrowings
Significant long-term debt issuances during the six months ended June 30, 2018 were as follows:
 
Principal Amount
 
Interest Rate
 
Maturity Date
 
(millions)
 
 
 
 
 
 
FPL - First mortgage bonds
$
1,500

 
3.950
%
-
4.125%
 
2048
NEECH - Debentures
$
1,200

 
Variable
(a) 
2019 - 2021
———————————————
(a)
Variable rate is based on an underlying index plus a margin.