Restructuring of Operations - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended		3 Months Ended
	Mar. 31, 2014 employee	Sep. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 9	$ 2
Discontinued operations charges				1
Estimated reduction of employees	200
Restructuring and related activities, completion date period		3 years
Restructuring accruals	23		23		25
Fiscal Year 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	11		11
Thereafter [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	12		12
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			7
Restructuring accruals	13		13		14
Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			2	2
Restructuring accruals	$ 10		$ 10		$ 11