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Restructuring Charges (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Balance as of January 1	$ 11us-gaap_RestructuringReserve	$ 20us-gaap_RestructuringReserve	$ 34us-gaap_RestructuringReserve
Charges	0us-gaap_RestructuringCharges	3us-gaap_RestructuringCharges	10us-gaap_RestructuringCharges
Cash Payments	(3)us-gaap_PaymentsForRestructuring	(12)us-gaap_PaymentsForRestructuring	(24)us-gaap_PaymentsForRestructuring
Balance as of December 31	8us-gaap_RestructuringReserve	11us-gaap_RestructuringReserve	20us-gaap_RestructuringReserve
Severance
Restructuring Reserve [Roll Forward]
Balance as of January 1	1	5	4
Charges	0	2	6
Cash Payments	0	(6)	(5)
Balance as of December 31	1	1	5
Lease obligations
Restructuring Reserve [Roll Forward]
Balance as of January 1	10	15	21
Charges	0	(1)	0
Cash Payments	(3)	(4)	(6)
Balance as of December 31	7	10	15
Other exit costs
Restructuring Reserve [Roll Forward]
Balance as of January 1	0	0	9
Charges	0	2	4
Cash Payments	0	(2)	(13)
Balance as of December 31	$ 0	$ 0	$ 0

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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