Restructuring of Operations - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014 employee	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 2	$ 8	$ 14	$ 14
Estimated reduction of employees	150
Restructuring and related activities, completion date period	2 years
Restructuring accruals	19	19		19		21	25
Fiscal Year 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	3	3		3
Thereafter [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	16	16		16
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1	3	9	6
Restructuring accruals	9	9		9		11	14
Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1	5	5	8
Discontinued operations charges					1
Restructuring accruals	$ 10	$ 10		$ 10		$ 10	$ 11