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Acquisitions and Dispositions - Acquisitions (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Business Acquisition 1 [Member] | Jun. 30, 2013 Business Acquisition 1 [Member] | Jun. 30, 2014 Risk Solutions [Member] business | Jun. 30, 2013 Risk Solutions [Member] business | Jun. 30, 2014 Risk Solutions [Member] business | Jun. 30, 2013 Risk Solutions [Member] business | Dec. 31, 2013 Risk Solutions [Member] | Jun. 30, 2014 HR Solutions [Member] business | Jun. 30, 2013 HR Solutions [Member] business | Dec. 31, 2013 HR Solutions [Member] | Jul. 15, 2014 Subsequent Event [Member] state employee
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Number of Employees |  |  |  |  |  |  |  |  |  |  |  |  | 800
Number of business acquired under business combination |  |  |  |  | 2 | 4 | 3 | 4 |  | 1 | 1 |  |
Consideration |  |  | $ 83 | $ 23 |  |  |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 9,099 | 8,997 | 52 | 16 | 6,107 |  | 6,107 |  | 6,020 | 2,992 |  | 2,977 |
Other intangible assets |  |  | 48 | 11 |  |  |  |  |  |  |  |  |
Total |  |  | $ 100 | $ 27 |  |  |  |  |  |  |  |  |
Policies Issued, Number of States |  |  |  |  |  |  |  |  |  |  |  |  | 50

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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