Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2018

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 Itemsa			Equity Method Investments			Total
Balance at December 31, 2017	$	234		$	(3	)	$	231
Other comprehensive income (loss) before reclassifications	—			1			1
Amounts reclassified from AOCI	25			(1		)	24
Balance at September 30, 2018	$	259		$	(3	)	$	256
Balance at December 31, 2016	$	122		$	(3	)	$	119
Other comprehensive income (loss) before reclassifications	—			(1		)	(1		)
Amounts reclassified from AOCI	(1		)	—			(1		)
Balance at September 30, 2017	$	121		$	(4	)	$	117

^a Amounts are net of tax.

Schedule of Reclassification out of Accumulated Other Comprehensive Income

Reclassifications out of AOCIb
	Three Months Ended September 30,
Details about AOCI Components	2018			2017			Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
Prior service credits	$	2		$	1		c
	2			1			Total before tax
	(1		)	(1		)	Tax benefit / (expense)
Total reclassifications for the period	$	1		$	—		Net of tax
	Nine Months Ended September 30,
Details about AOCI Components	2018			2017			Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
Prior service credits	$	2		$	2		c
Reclassification due to ASU 2016-01 adoption	1			—
Reclassification due to ASU 2018-02 adoption	(26		)	—
	(23		)	2			Total before tax
	(1		)	(1		)	Tax benefit / (expense)
Total reclassifications for the period	$	(24	)	$	1		Net of tax

^b Amounts in parentheses indicate debits to the income statement.

^c This accumulated other comprehensive income component is included in the computation of net periodic pension and retiree health and welfare cost (see Note 9 for additional details).