Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2023

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

Schedule of Accumulated Other Comprehensive Income (Loss)

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

	Pension and Retiree Health and Welfare Benefit Items		Equity Method Investments		Total
Balance as of December 31, 2020	$	101	$	(3)	$	98
Other comprehensive income (loss) before reclassifications, net of $81 million tax expense	251		—		251
Amounts reclassified from AOCI:
Amortization of actuarial lossesa	6		—		6
Settlement (gain) lossa	(1)		—		(1)
Tax expense (benefit)	(1)		—		(1)
Balance as of December 31, 2021	$	356	$	(3)	$	353
Other comprehensive income (loss) before reclassifications, net of $56 million tax benefit	(175)		12		(163)
Amounts reclassified from AOCI:
Amortization of actuarial lossesa	6		—		6
Settlement (gain) lossa	(1)		—		(1)
Tax expense (benefit)	(1)		—		(1)
Balance as of December 31, 2022	$	185	$	9	$	194
Other comprehensive income (loss) before reclassifications, net of $21 million tax expense	68		(1)		67
Amounts reclassified from AOCI:
Amortization of actuarial gainsa	(36)		—		(36)
Tax expense (benefit)	9		—		9
Balance as of December 31, 2023	$	226	$	8	$	234

a     This accumulated other comprehensive income component is included in the computation of net periodic pension cost (see Note 15 for additional details).