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Acquisitions and Dispositions - Dispositions (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) business | Jun. 30, 2014 USD ($) business | Jun. 30, 2015 USD ($) business | Jun. 30, 2014 USD ($) business
Dispositions |  |  |  |
Number of dispositions | 0 | 0 |  |
Gain on disposal of business | $ | $ 1 | $ 0 | $ 20 | $ 0
Risk Solutions [Member] |  |  |  |
Dispositions |  |  |  |
Number of dispositions |  |  | 1 | 1
Gain on disposal of business | $ |  | $ 1 |  |
HR Solutions [Member] |  |  |  |
Dispositions |  |  |  |
Number of dispositions |  |  | 1 |

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