Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2024						Three Months Ended June 30, 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 April 1	$	(30)	$	(41)	$	(71)	$	(58)	$	(39)	$	(97)
Other comprehensive gain before reclassifications	—		—		—		13		—		13
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	—		—		—		1		—		1
Amortization of net actuarial losses (b)	—		4		4		—		1		1
Net current period other comprehensive income	—		4		4		14		1		15
Accumulated other comprehensive loss at June 30	$	(30)	$	(37)	$	(67)	$	(44)	$	(38)	$	(82)

	Six Months Ended June 30, 2024						Six Months Ended June 30, 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 before reclassifications	22		—		22		8		—		8
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)	1		—		1		2		—		2
Amortization of net actuarial losses (b)	—		4		4		—		1		1
Net current period other comprehensive income	23		4		27		10		1		11
Accumulated other comprehensive loss at June 30	$	(30)	$	(37)	$	(67)	$	(44)	$	(38)	$	(82)

(a)Included in interest charges.

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