Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2017

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, 2016	$	122	$	(3	)	$	119
Other comprehensive (loss) before reclassifications	—		(2		)	(2		)
Amounts reclassified from AOCI	—		—			—
Balance at March 31, 2017	$	122	$	(5	)	$	117
Balance at December 31, 2015	$	50	$	(2	)	$	48
Other comprehensive (loss) before reclassifications	—		(2		)	(2		)
Amounts reclassified from AOCI	—		—			—
Balance at March 31, 2016	$	50	$	(4	)	$	46

^a Amounts are net of tax.

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]