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Business Segments (Revenue By Geographical Area) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Total revenues	$ 3,438	$ 3,197	$ 3,411
Property and equipment, net	193	164	164
Number of customers	0	0	0
Minimum revenue accounted percentage	10.00%	10.00%	10.00%
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	2,707	2,564	2,744
Property and equipment, net	125	99	102
All Other Countries [Member]
Segment Reporting Information [Line Items]
Total revenues	731	633	667
Property and equipment, net	$ 68	$ 65	$ 62

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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