Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	$ (155)		$ (155)		$ (156)	$ (158)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	0	0	0	1
Current period change, net of tax Foreign Currency Translation	(1)	(1)	(2)	0
Other Comprehensive Income (Loss), Net of Tax	1		3
Other Comprehensive Income Before Reclassifications	(1)		(2)
Amounts Reclassified From Accumulated Other Comprehensive Income	2		5
Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Unrealized Gain/(Loss) on Derivaive	(4)		(4)		(4)	(4)
Current period change, net of tax Net Unrealized Gain/(Loss) on Derivatives Gain (Loss) on Derivatives Arising During Period, Net of Tax	0		0
Other Comprehensive Income Before Reclassifications	0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	0		0
Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net Unrealized Gain/(Loss) on Investments	(8)		(8)		(8)	(8)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	0		0
Other Comprehensive Income Before Reclassifications	0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	0		0
Pension and Other Postretirement Plans Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Benefit Obligations	(143)		(143)		(145)	(148)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	2		5
Other Comprehensive Income Before Reclassifications	0		0
Amounts Reclassified From Accumulated Other Comprehensive Income	2		5
Foreign currency exchange contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign Currency Translation	0		0		1	2
Current period change, net of tax Foreign Currency Translation	(1)		(2)
Other Comprehensive Income Before Reclassifications	(1)		(2)
Amounts Reclassified From Accumulated Other Comprehensive Income	$ 0		$ 0