Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2025

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, 2023	$	226	$	8	$	234
Other comprehensive income (loss), net before reclassifications	—		1		1
Amounts reclassified from AOCI:
Amortization of actuarial (gains) lossesa	(5)		—		(5)
Tax expense (benefit)	1		—		1
Balance as of March 31, 2024	$	222	$	9	$	231
Balance as of December 31, 2024	$	572	$	9	$	581
Other comprehensive income (loss), net before reclassifications	—		1		1
Amounts reclassified from AOCI:
Amortization of actuarial (gains) lossesa	(8)		—		(8)
Tax expense (benefit)	2		—		2
Balance as of March 31, 2025	$	566	$	10	$	576

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).