Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2023

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:

	2023
(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	$	(20)		$	(2)		$	(22)
Other comprehensive loss before reclassifications	—			—			—
Losses reclassified from net accumulated other comprehensive loss:
Amortization of interest rate hedges	1		(a)	—			1
Amortization of net actuarial loss	—			1		(b)	1
Net current period other comprehensive income	1			1			2
Accumulated other comprehensive loss at Dec. 31	$	(19)		$	(1)		$	(20)

(a)Included in interest charges.

(b)Included in the computation of net periodic pension and postretirement benefit costs. See Note 9 for further information.

	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.