Restructuring of Operations - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended			6 Months Ended					3 Months Ended				3 Months Ended
	Jun. 30, 2014 employee	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Fiscal Year 2014 [Member]	Jun. 30, 2014 Thereafter [Member]	Jun. 30, 2014 Employee Termination Benefits [Member]	Mar. 31, 2014 Employee Termination Benefits [Member]	Jun. 30, 2013 Employee Termination Benefits [Member]	Dec. 31, 2013 Employee Termination Benefits [Member]	Jun. 30, 2014 Exit Costs [Member]	Mar. 31, 2014 Exit Costs [Member]	Jun. 30, 2013 Exit Costs [Member]	Mar. 31, 2013 Exit Costs [Member]	Dec. 31, 2013 Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 3	$ 9	$ 4	$ 12	$ 6				$ 1	$ 7	$ 3		$ 2	$ 2	$ 1	$ 2
Discontinued operations charges																	1
Estimated reduction of employees	200
Restructuring and related activities, completion date period	3 years
Restructuring accruals	$ 21	$ 21	$ 23		$ 21		$ 25	$ 8	$ 13	$ 11	$ 13		$ 14	$ 10	$ 10			$ 11