XML 41 R27.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table summarizes the fair value and carrying amount of OG&E's financial instruments at December 31, 2017 and 2016.

Year Ended December 31 (In millions)
2017
2016
 
Carrying
Amount 
Fair
Value
Carrying
Amount 
Fair
Value
Long-term Debt (including Long-term Debt due within one year):
 
 
 
 
Senior Notes
$
2,854.3

$
3,242.8

$
2,385.5

$
2,657.2

Industrial Authority Bonds
135.4

135.4

135.4

135.4

Tinker Debt
9.7

9.8

9.9

11.3