Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2013

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 loss by component (in millions):

	Pension and Retiree Health and Welfare Benefit Itemsa			Equity Method Investments			Total
Balance at December 31, 2012	$	(241	)	$	(4	)	$	(245	)
Other comprehensive income before reclassifications	—			(1		)	(1		)
Amounts reclassified from accumulated other comprehensive loss	6			—			6
Balance at June 30, 2013	$	(235	)	$	(5	)	$	(240	)

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

Reclassifications out of Accumulated Other Comprehensive Loss
	Three Months Ended June 30,
Details about Accumulated Other Comprehensive Loss Components	2013			Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
Actuarial losses	$	5		b
	5			Total before tax
	(2		)	Tax (expense)/benefit
Total reclassifications for the period	$	3		Net of tax
	Six Months Ended June 30,
Details about Accumulated Other Comprehensive Loss Components	2013			Income Statement Line Item
Amortization of pension and retiree health and welfare benefit items
Actuarial losses	$	10		b
	10			Total before tax
	(4		)	Tax (expense)/benefit
Total reclassifications for the period	$	6		Net of tax

^b This accumulated other comprehensive loss component is included in the computation of net periodic pension cost (see Note 8 for additional details).