Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 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	26			(1		)	25
Balance at June 30, 2018	$	260		$	(3	)	$	257
Balance at December 31, 2016	$	122		$	(3	)	$	119
Other comprehensive income (loss) before reclassifications	—			(1		)	(1		)
Amounts reclassified from AOCI	(1		)	—			(1		)
Balance at June 30, 2017	$	121		$	(4	)	$	117

^a Amounts are net of tax.