Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

NSP-Wisconsin's segment information:

	Three Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues (a)	$	224	$	199
Net income	16		16
Regulated Natural Gas
Total revenues	$	31	$	19
Net loss	(2)		(3)
All Other
Total revenues	$	—	$	—
Net loss	—		(1)
Consolidated Total
Total revenues (a)	$	255	$	218
Net income	14		12

(a)    Total revenues include $46 million and $41 million of affiliate electric revenue for the three months ended June 30, 2021 and 2020, respectively.

	Six Months Ended June 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues (a)	$	448	$	411
Net income	40		41
Regulated Natural Gas
Total revenues	$	88	$	64
Net income	6		6
All Other
Total revenues	$	—	$	—
Net loss	—		(1)
Consolidated Total
Total revenues (a)	$	536	$	475
Net income	46		46

(a)    Total revenues include $92 million and $82 million of affiliate electric revenue for the six months ended June 30, 2021 and 2020, respectively.