Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2024

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table provides the components of accumulated other comprehensive income (loss) (AOCI) by component (in millions):

	Pension and Retiree Health and Welfare Benefit Items		Equity Method Investments		Accumulated Other Comprehensive Income (Loss)
Balance as of December 31, 2022	$	185	$	9	$	194
Other comprehensive income (loss), net before reclassifications	—		(1)		(1)
Amounts reclassified from AOCI:
Amortization of actuarial (gains) lossesa	(18)		—		(18)
Tax expense (benefit)	5		—		5
Balance as of June 30, 2023	$	172	$	8	$	180
Balance as of December 31, 2023	$	226	$	8	$	234
Other comprehensive income (loss), net before reclassifications	—		1		1
Amounts reclassified from AOCI:
Amortization of actuarial (gains) lossesa	(10)		—		(10)
Tax expense (benefit)	2		—		2
Balance as of June 30, 2024	$	218	$	9	$	227

a     This accumulated other comprehensive income component is included in the computation of net periodic pension and retiree health and welfare costs (see Note 7 for additional details on pension costs).