Accumulated Other Comprehensive Income

12 Months Ended

Dec. 31, 2019

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

Other comprehensive income refers to revenues, expenses, gains and losses that under generally accepted accounting principles are included in accumulated other comprehensive income, a component of equity within the Consolidated Balance Sheets, rather than net income on the Consolidated Statements of Income. Under existing accounting standards, other comprehensive income may include, among other things, unrecognized gains and losses and prior service credit related to pension and other postretirement benefit plans.

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, 2016	$	122		$	(3	)	$	119
Other comprehensive income (loss), net before reclassifications	114			—			114
Amounts reclassified from AOCI:
Amortization of prior service credits^a	(2		)	—			(2		)
Tax expense (benefit)	—			—			—
Balance as of December 31, 2017	$	234		$	(3	)	$	231
Other comprehensive income (loss), net before reclassifications	(126		)	1			(125		)
Amounts reclassified from AOCI:
Reclassification due to ASU 2016-01 adoption	—			(1		)	(1		)
Reclassification due to ASU 2018-02 adoption	26			—			26
Amortization of actuarial losses^a	1			—			1
Amortization of prior service credits^a	(3		)	—			(3		)
Tax expense (benefit)	1			—			1
Balance as of December 31, 2018	$	133		$	(3	)	$	130
Other comprehensive income (loss), net before reclassifications	16			(1		)	15
Amounts reclassified from AOCI:
Amortization of prior service credits^a	(4		)	—			(4		)
Settlement loss^a	5			—			5
Tax expense (benefit)	(1		)	—			(1		)
Balance as of December 31, 2019	$	149		$	(4	)	$	145


^a	This accumulated other comprehensive income component is included in the computation of net periodic pension cost (see Note 13 for additional details).