Other Comprehensive Income

6 Months Ended

Jun. 30, 2023

Stockholders' Equity Note [Abstract]

Other Comprehensive Income

Changes in accumulated other comprehensive loss, net of tax:

	Three Months Ended June 30, 2023						Three Months Ended June 30, 2022
(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	$	(20)	$	(1)	$	(21)	$	(21)	$	(1)	$	(22)
Losses reclassified from net accumulated other comprehensive loss:
Amortization of net actuarial loss (a)	—		—		—		—		—		—
Net current period other comprehensive income	—		—		—		—		—		—
Accumulated other comprehensive loss at June 30	$	(20)	$	(1)	$	(21)	$	(21)	$	(1)	$	(22)

	Six Months Ended June 30, 2023						Six Months Ended June 30, 2022
(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	$	(20)	$	(2)	$	(22)	$	(21)	$	(1)	$	(22)
Losses reclassified from net accumulated other comprehensive loss:
Amortization of net actuarial loss (a)	—		1		1		—		—		—
Net current period other comprehensive income	—		1		1		—		—		—
Accumulated other comprehensive loss at June 30	$	(20)	$	(1)	$	(21)	$	(21)	$	(1)	$	(22)

(a) Included in the computation of net periodic pension and postretirement benefit costs. See Note 8 for further information.