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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 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 years ended December 31, 2016 and 2015, respectively, 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 | 2 |  |  | 16 |  |  | 18 |
Goodwill related to disposals | (1 | ) |  | (76 | ) |  | (77 | )
Goodwill related to prior year acquisitions | — |  |  | — |  |  | — |
Foreign currency translation | (319 | ) |  | (34 | ) |  | (353 | )
Balance as of December 31, 2015 | $ | 5,593 |  |  | $ | 2,855 |  |  | $ | 8,448 |
Goodwill related to current year acquisitions | 632 |  |  | 10 |  |  | 642 |
Goodwill related to disposals | (8 | ) |  | (26 | ) |  | (34 | )
Goodwill related to prior year acquisitions | 4 |  |  | — |  |  | 4 |
Foreign currency translation | (268 | ) |  | (45 | ) |  | (313 | )
Balance as of December 31, 2016 | $ | 5,953 |  |  | $ | 2,794 |  |  | $ | 8,747 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| As of December 31
| 2016 |  | 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Intangible assets with indefinite lives: |  |  |  |  |  |  |  |  |  |  |
Tradenames | $ | 998 |  |  | $ | — |  |  | $ | 998 |  |  | $ | 1,019 |  |  | $ | — |  |  | $ | 1,019 |
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |
Customer related and contract based | 3,108 |  |  | 1,971 |  |  | 1,137 |  |  | 2,886 |  |  | 1,809 |  |  | 1,077 |
Technology and other | 574 |  |  | 486 |  |  | 88 |  |  | 541 |  |  | 457 |  |  | 84 |
Total | $ | 4,680 |  |  | $ | 2,457 |  |  | $ | 2,223 |  |  | $ | 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 December 31, 2016 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
2017 | $ | 123 |  |  | $ | 136 |  |  | $ | 259 |
2018 | 118 |  |  | 91 |  |  | 209 |
2019 | 107 |  |  | 73 |  |  | 180 |
2020 | 97 |  |  | 61 |  |  | 158 |
2021 | 66 |  |  | 53 |  |  | 119 |
Thereafter | 239 |  |  | 61 |  |  | 300 |
Total | $ | 750 |  |  | $ | 475 |  |  | $ | 1,225 |

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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=66006027&loc=d3e16323-109275 + Details
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