Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2022

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:

	2022
(Millions of Dollars)	Gains and Losses on Interest Rate Cash Flow Hedges			Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(21)		$	(1)	$	(22)
Other comprehensive loss before reclassifications	—			(1)		(1)
Losses reclassified from net accumulated other comprehensive loss:
Amortization of interest rate hedges	1		(a)	—		1
Net current period other comprehensive income (loss)	1			(1)		—
Accumulated other comprehensive loss at Dec. 31	$	(20)		$	(2)	$	(22)

(a)Included in interest charges.

	2021
(Millions of Dollars)	Gains and Losses on Interest Rate Cash Flow Hedges			Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(23)		$	(1)	$	(24)
Losses reclassified from net accumulated other comprehensive loss:
Amortization of interest rate hedges	1		(a)	—		1
Amortization of net actuarial gains	1			—		1
Net current period other comprehensive income	2			—		2
Accumulated other comprehensive loss at Dec. 31	$	(21)		$	(1)	$	(22)

(a)Included in interest charges.