Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

The following table presents OG&E's revenues from contracts with customers disaggregated by customer classification. OG&E's operating revenues disaggregated by customer classification can be found in "OG&E (Electric Utility) Results of Operations" within "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."

	Year Ended December 31,
(In millions)	2020		2019		2018
Residential	$	842.7	$	865.8	$	877.8
Commercial	465.6		486.6		500.0
Industrial	192.6		217.8		228.9
Oilfield	169.2		200.4		190.4
Public authorities and street light	172.3		190.3		197.4
System sales revenues	1,842.4		1,960.9		1,994.5
Provision for rate refund	3.8		(0.9)		(6.0)
Integrated market	49.6		38.4		48.7
Transmission	143.3		148.0		147.4
Other	30.7		29.1		27.1
Revenues from contracts with customers	$	2,069.8	$	2,175.5	$	2,211.7