Restructuring Charges (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Balance
Balance as of December 31	$ 20
Charges	3
Cash payments	(11)
Balance as of September 30	12
Severance [Member]
Balance
Balance as of December 31	5
Charges	3
Cash payments	(7)
Balance as of September 30	1
Lease obligations [Member]
Balance
Balance as of December 31	15
Charges	(1)
Cash payments	(3)
Balance as of September 30	11
Other exit costs [Member]
Balance
Balance as of December 31	0
Charges	1
Cash payments	(1)
Balance as of September 30	$ 0