Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2020

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, 2018	$	133		$	(3	)	$	130
Other comprehensive income (loss), net before reclassifications	66			(1		)	65
Amounts reclassified from AOCI:
Amortization of net gaina	(1		)	—			(1		)
Amortization of prior service creditsa	(3		)	—			(3		)
Tax expense (benefit)	1			—			1
Balance as of March 31, 2019	$	196		$	(4	)	$	192
Balance as of December 31, 2019	$	149		$	(4	)	$	145
Other comprehensive income (loss), net before reclassifications	—			1			1
Balance as of March 31, 2020	$	149		$	(3	)	$	146

^a This accumulated other comprehensive income component is included in the computation of net periodic pension cost (see Note 6 for additional details).