Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

NSP-Wisconsin's segment information:

	Three Months Ended Sept. 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues (a)	$	252	$	236
Net income	38		40
Regulated Natural Gas
Operating revenues — external	$	22	$	15
Intersegment revenue	1		—
Total revenues	$	23	$	15
Net loss	(4)		(2)
All Other
Net income	$	2	$	2
Consolidated Total
Total revenues (a)	$	275	$	251
Reconciling eliminations	(1)		—
Total operating revenues	$	274	$	251
Net income	36		40

(a)Total revenues include $49 million and $41 million of affiliate electric revenue for the three months ended Sept. 30, 2021 and 2020, respectively.

	Nine Months Ended Sept. 30
(Millions of Dollars)	2021		2020
Regulated Electric
Total revenues (a)	$	700	$	647
Net income	77		81
Regulated Natural Gas
Operating revenues — external	$	110	$	79
Intersegment revenue	1		—
Total revenues	$	111	$	79
Net income	3		3
All Other
Net income	$	2	$	1
Consolidated Total
Total revenues (a)	$	811	$	726
Reconciling eliminations	(1)		—
Total operating revenues	$	810	$	726
Net income	82		85

(a)Total revenues include $141 million and $123 million of affiliate electric revenue for the nine months ended Sept. 30, 2021 and 2020, respectively.