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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 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 years ended December 31, 2015 and 2014, respectively, are as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Balance as of January 1, 2014 | $ | 6,020 |  |  | $ | 2,977 |  |  | $ | 8,997 |
Goodwill related to current year acquisitions | 287 |  |  | 5 |  |  | 292 |
Goodwill related to disposals | (14 | ) |  | — |  |  | (14 | )
Goodwill related to prior year acquisitions | (8 | ) |  | — |  |  | (8 | )
Transfer | (2 | ) |  | 2 |  |  | — |
Foreign currency translation | (372 | ) |  | (35 | ) |  | (407 | )
Balance as of December 31, 2014 | $ | 5,911 |  |  | $ | 2,949 |  |  | $ | 8,860 |
Goodwill related to current year acquisitions | 2 |  |  | 16 |  |  | 18 |
Goodwill related to disposals | (1 | ) |  | (76 | ) |  | (77 | )
Goodwill related to prior year acquisitions | — |  |  | — |  |  | — |
Transfer | — |  |  | — |  |  | — |
Foreign currency translation | (319 | ) |  | (34 | ) |  | (353 | )
Balance as of December 31, 2015 | $ | 5,593 |  |  | $ | 2,855 |  |  | $ | 8,448 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| As of December 31
| 2015 |  | 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 | 2,886 |  |  | 1,809 |  |  | 1,077 |  |  | 2,952 |  |  | 1,579 |  |  | 1,373 |
Technology and other | 541 |  |  | 457 |  |  | 84 |  |  | 571 |  |  | 443 |  |  | 128 |
| $ | 4,446 |  |  | $ | 2,266 |  |  | $ | 2,180 |  |  | $ | 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 December 31, 2015 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
2016 | $ | 100 |  |  | $ | 171 |  |  | $ | 271 |
2017 | 90 |  |  | 136 |  |  | 226 |
2018 | 76 |  |  | 91 |  |  | 167 |
2019 | 66 |  |  | 72 |  |  | 138 |
2020 | 58 |  |  | 60 |  |  | 118 |
Thereafter | 120 |  |  | 120 |  |  | 240 |
| $ | 510 |  |  | $ | 650 |  |  | $ | 1,160 |

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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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