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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the net carrying amount of goodwill by operating segment | The changes in the net carrying amount of goodwill by reportable segment for the three months ended March 31, 2014 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Balance as of December 31, 2013 | $ | 6,020 |  |  | $ | 2,977 |  |  | $ | 8,997 |
Goodwill related to current year acquisitions | 2 |  |  | 2 |  |  | 4 |
Goodwill related to prior year acquisitions | (1 | ) |  | — |  |  | (1 | )
Foreign currency translation | 31 |  |  | (1 | ) |  | 30 |
Balance as of March 31, 2014 | $ | 6,052 |  |  | $ | 2,978 |  |  | $ | 9,030 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| March 31, 2014 |  | December 31, 2013
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Intangible assets with indefinite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tradenames | $ | 1,019 |  |  | $ | — |  |  | $ | 1,019 |  |  | $ | 1,019 |  |  | $ | — |  |  | $ | 1,019 |
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer related and contract based | 2,729 |  |  | 1,386 |  |  | 1,343 |  |  | 2,720 |  |  | 1,310 |  |  | 1,410 |
Marketing, technology and other | 587 |  |  | 449 |  |  | 138 |  |  | 584 |  |  | 435 |  |  | 149 |
| $ | 4,335 |  |  | $ | 1,835 |  |  | $ | 2,500 |  |  | $ | 4,323 |  |  | $ | 1,745 |  |  | $ | 2,578 |
Schedule of estimated future amortization expense on intangible assets | The estimated future amortization for finite lived intangible assets as of March 31, 2014 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Remainder of 2014 | $ | 77 |  |  | $ | 183 |  |  | $ | 260 |
2015 | 83 |  |  | 212 |  |  | 295 |
2016 | 70 |  |  | 177 |  |  | 247 |
2017 | 59 |  |  | 141 |  |  | 200 |
2018 | 47 |  |  | 93 |  |  | 140 |
Thereafter | 89 |  |  | 250 |  |  | 339 |
| $ | 425 |  |  | $ | 1,056 |  |  | $ | 1,481 |

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- Definition Tabular disclosure of the class of other intangible assets, which includes finite and indefinite-lived intangible assets. + References No definition available. + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 + Details
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