Other Intangible Assets, Net (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	$ 764	$ 755
Total amortizable intangible assets, Accumulated amortization	(303)	(263)
Total amortizable intangible assets, Net carrying amount	461	492
Client Relationships [Member]
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	705	695
Total amortizable intangible assets, Accumulated amortization	(247)	(207)
Total amortizable intangible assets, Net carrying amount	458	488
Client Lists [Member]
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	8	9
Total amortizable intangible assets, Accumulated amortization	(7)	(7)
Total amortizable intangible assets, Net carrying amount	1	2
Non-compete Agreements [Member]
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	36	36
Total amortizable intangible assets, Accumulated amortization	(36)	(36)
Total amortizable intangible assets, Net carrying amount	0	0
Trade Names [Member]
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	11	11
Total amortizable intangible assets, Accumulated amortization	(10)	(10)
Total amortizable intangible assets, Net carrying amount	1	1
Total Customer and Marketing Related [Member]
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	760	751
Total amortizable intangible assets, Accumulated amortization	(300)	(260)
Total amortizable intangible assets, Net carrying amount	460	491
Contract Based, Technology and Other [Member]
Summary of major classes of amortizable intangible assets
Total amortizable intangible assets, Gross carrying amount	4	4
Total amortizable intangible assets, Accumulated amortization	(3)	(3)
Total amortizable intangible assets, Net carrying amount	$ 1	$ 1