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Acquisitions and Dispositions - Acquisitions (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 | Dec. 31, 2014 USD ($)
Intangible assets: |  |  |  |  |
Goodwill | $ 8,571 |  | $ 8,571 |  | $ 8,860
Business Acquisition 1 [Member] |  |  |  |  |
Business Acquisition |  |  |  |  |
Consideration | 26 | $ 446 | 26 | $ 446 |
Intangible assets: |  |  |  |  |
Goodwill | 18 | 261 | 18 | 261 |
Other intangible assets | 1 | 310 | 1 | 310 |
Total | 19 | $ 571 | $ 19 | $ 571 |
Risk Solutions [Member] |  |  |  |  |
Business Acquisition |  |  |  |  |
Number of business acquired under business combination | business |  | 4 | 2 | 7 |
Intangible assets: |  |  |  |  |
Goodwill | $ 5,652 |  | $ 5,652 |  | 5,911
HR Solutions [Member] |  |  |  |  |
Business Acquisition |  |  |  |  |
Number of business acquired under business combination | business | 1 | 1 | 3 | 2 |
Intangible assets: |  |  |  |  |
Goodwill | $ 2,919 |  | $ 2,919 |  | $ 2,949

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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=56956791&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: 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=56956791&loc=d3e4845-128472 + Details
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