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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2015
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 nine months ended September 30, 2015 are as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Balance as of January 1, 2015 | $ | 5,911 |  |  | $ | 2,949 |  |  | $ | 8,860 |
Goodwill related to current year acquisitions | 3 |  |  | 15 |  |  | 18 |
Goodwill related to disposals | — |  |  | (13 | ) |  | (13 | )
Goodwill related to prior year acquisitions | 4 |  |  | — |  |  | 4 |
Foreign currency translation | (266 | ) |  | (32 | ) |  | (298 | )
Balance as of September 30, 2015 | $ | 5,652 |  |  | $ | 2,919 |  |  | $ | 8,571 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| September 30, 2015 |  | December 31, 2014
| 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 | 2,899 |  |  | 1,753 |  |  | 1,146 |  |  | 2,952 |  |  | 1,579 |  |  | 1,373 |
Technology and other | 541 |  |  | 449 |  |  | 92 |  |  | 571 |  |  | 443 |  |  | 128 |
Total | $ | 4,459 |  |  | $ | 2,202 |  |  | $ | 2,257 |  |  | $ | 4,542 |  |  | $ | 2,022 |  |  | $ | 2,520 |
Schedule of estimated future amortization expense on intangible assets | The estimated future amortization for finite lived intangible assets as of September 30, 2015 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Remainder of 2015 | $ | 51 |  |  | $ | 28 |  |  | $ | 79 |
2016 | 172 |  |  | 100 |  |  | 272 |
2017 | 137 |  |  | 91 |  |  | 228 |
2018 | 91 |  |  | 78 |  |  | 169 |
2019 | 72 |  |  | 68 |  |  | 140 |
Thereafter | 164 |  |  | 186 |  |  | 350 |
Total | $ | 687 |  |  | $ | 551 |  |  | $ | 1,238 |

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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=35741047&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=35741047&loc=d3e13854-109267 + 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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