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Goodwill and Other Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2016
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 six months ended June 30, 2016 are as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Balance as of January 1, 2016 | $ | 5,593 |  |  | $ | 2,855 |  |  | $ | 8,448 |
Goodwill related to current year acquisitions | 106 |  |  | 4 |  |  | 110 |
Goodwill related to disposals | (7 | ) |  | (26 | ) |  | (33 | )
Goodwill related to prior year acquisitions | 2 |  |  | — |  |  | 2 |
Foreign currency translation | (40 | ) |  | (14 | ) |  | (54 | )
Balance as of June 30, 2016 | $ | 5,654 |  |  | $ | 2,819 |  |  | $ | 8,473 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| June 30, 2016 |  | December 31, 2015
| 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 | 2,923 |  |  | 1,899 |  |  | 1,024 |  |  | 2,886 |  |  | 1,809 |  |  | 1,077 |
Technology and other | 542 |  |  | 478 |  |  | 64 |  |  | 541 |  |  | 457 |  |  | 84 |
Total | $ | 4,484 |  |  | $ | 2,377 |  |  | $ | 2,107 |  |  | $ | 4,446 |  |  | $ | 2,266 |  |  | $ | 2,180 |
Schedule of estimated future amortization expense on intangible assets | The estimated future amortization for finite lived intangible assets as of June 30, 2016 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Remainder of 2016 | $ | 44 |  |  | $ | 103 |  |  | $ | 147 |
2017 | 81 |  |  | 147 |  |  | 228 |
2018 | 73 |  |  | 99 |  |  | 172 |
2019 | 66 |  |  | 79 |  |  | 145 |
2020 | 58 |  |  | 65 |  |  | 123 |
Thereafter | 157 |  |  | 116 |  |  | 273 |
Total | $ | 479 |  |  | $ | 609 |  |  | $ | 1,088 |

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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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