Inventories, net (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories, Net
Finished goods	$ 112	$ 149
Purchased parts and components	11	22
Inventories, net	123us-gaap_InventoryNet	171us-gaap_InventoryNet
Inventory reserves	$ 52us-gaap_InventoryValuationReserves	$ 42us-gaap_InventoryValuationReserves

Amount of valuation reserve for inventory.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 6

-Subparagraph a

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Section S99

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Topic 330

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant