Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisitions and Dispositions - Dispositions (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) business	Sep. 30, 2014 USD ($) business	Sep. 30, 2015 USD ($) business	Sep. 30, 2014 USD ($) business
Dispositions
Gain on disposal of business \| $	$ 0	$ 25	$ 20	$ 25
Risk Solutions [Member]
Dispositions
Number of dispositions	1	1	2	2
Gain on disposal of business \| $		$ 25		$ 25
HR Solutions [Member]
Dispositions
Number of dispositions			1