Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2024

Stockholders' Equity Note [Abstract]

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

Changes in accumulated other comprehensive loss, net of tax:

	Three Months Ended March 31, 2024						Three Months Ended March 31, 2023
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total		Gains and Losses on Cash Flow Hedges		Defined Benefit Pension and Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1	$	(53)	$	(41)	$	(94)	$	(54)	$	(39)	$	(93)
Other comprehensive gain (loss) before reclassifications	22		—		22		(5)		—		(5)
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		1		—		1
Net current period other comprehensive income (loss)	23		—		23		(4)		—		(4)
Accumulated other comprehensive loss at March 31	$	(30)	$	(41)	$	(71)	$	(58)	$	(39)	$	(97)

(a)Included in interest charges.