Restructuring of Operations - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2013 employee	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 8	$ 6	$ 14	$ 30
Discontinued operations charges			1	1	3
Estimated reduction of employees over the next two years (in employees)	300
Restructuring and related activities, completion date period	3 years
Restructuring accruals	24	24		24		25	40
Fiscal Year 2013
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	7	7		7
Thereafter
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	17	17		17
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring expense		3	4	6	15
Discontinued operations charges
Restructuring accruals	12	12		12		14	27
Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense		5	3	9	18
Discontinued operations charges				1
Restructuring accruals	$ 12	$ 12		$ 12		$ 11	$ 13