Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2021

Stockholders' Equity Note [Abstract]

Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax

Changes in accumulated other comprehensive loss, net of tax, for the years ended Dec. 31:

	2021
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(19)		$	(3)	$	(22)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives, net of tax of $—	2		(a)	—		2
Net current period other comprehensive income	2			—		2
Accumulated other comprehensive loss at Dec. 31	$	(17)		$	(3)	$	(20)

(a)Included in interest charges.

	2020
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(20)		$	(3)	$	(23)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives, net of tax of $—	1		(a)	—		1
Net current period other comprehensive income	1			—		1
Accumulated other comprehensive loss at Dec. 31	$	(19)		$	(3)	$	(22)

(a)Included in interest charges.