Employee Retirement and Other Termination Benefits Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Feb. 07, 2013 VSP Program	Dec. 31, 2012 VSP Program	Jun. 30, 2013 VSP Benefit Total [Member] VSP Program	Jun. 30, 2012 VSP Benefit Total [Member] VSP Program	Jun. 30, 2013 VSP Benefit Total [Member] VSP Program	Jun. 30, 2012 VSP Benefit Total [Member] VSP Program
Defined Benefit Plan Disclosure [Line Items]
Number of Employees Selected for Voluntary Program						275
Number of Employees That Accepted Voluntary Program					211
Employee retirement and other termination benefits	$ 7	$ 1	$ 140	$ 1			$ 6	$ 0	$ 62	$ 0