Supplemental Financial Information (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Property and Equipment
Property and equipment, gross	$ 982	$ 800
Less accumulated depreciation and amortization	(519)	(432)
Property and equipment, net	463	368
Leasehold improvements [Member]
Property and Equipment
Property and equipment, gross	225	212
Leasehold improvements [Member] \| Maximum [Member]
Property and Equipment
Property and equipment, Useful Life	10 years
Leasehold improvements [Member] \| Minimum [Member]
Property and Equipment
Property and equipment, Useful Life	1 year
Office furniture and equipment [Member]
Property and Equipment
Property and equipment, gross	40	38
Office furniture and equipment [Member] \| Maximum [Member]
Property and Equipment
Property and equipment, Useful Life	7 years
Office furniture and equipment [Member] \| Minimum [Member]
Property and Equipment
Property and equipment, Useful Life	3 years
Machinery and equipment [Member]
Property and Equipment
Property and equipment, gross	511	396
Property and equipment, Useful Life	5 years
Computer software and equipment [Member]
Property and Equipment
Property and equipment, gross	173	128
Computer software and equipment [Member] \| Maximum [Member]
Property and Equipment
Property and equipment, Useful Life	10 years
Computer software and equipment [Member] \| Minimum [Member]
Property and Equipment
Property and equipment, Useful Life	2 years
Construction in progress [Member]
Property and Equipment
Property and equipment, gross	$ 33	$ 26

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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