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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 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 years ended December 31, 2014 and 2013, respectively, are as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
Balance as of January 1, 2013 | $ | 5,982 |  |  | $ | 2,961 |  |  | $ | 8,943 |
Goodwill related to acquisitions | 36 |  |  | 2 |  |  | 38 |
Goodwill related to disposals | (9 | ) |  | (3 | ) |  | (12 | )
Goodwill related to other prior year acquisitions | (2 | ) |  | 17 |  |  | 15 |
Foreign currency translation | 13 |  |  | — |  |  | 13 |
Balance as of December 31, 2013 | $ | 6,020 |  |  | $ | 2,977 |  |  | $ | 8,997 |
Goodwill related to acquisitions | 287 |  |  | 5 |  |  | 292 |
Goodwill related to disposals | (14 | ) |  | — |  |  | (14 | )
Goodwill related to other 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 |
Schedule of other intangible assets by asset class | Other intangible assets by asset class are as follows (in millions):
| As of December 31
| 2014 |  | 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 | 2,952 |  |  | 1,579 |  |  | 1,373 |  |  | 2,720 |  |  | 1,310 |  |  | 1,410 |
Technology and other | 571 |  |  | 443 |  |  | 128 |  |  | 584 |  |  | 435 |  |  | 149 |
| $ | 4,542 |  |  | $ | 2,022 |  |  | $ | 2,520 |  |  | $ | 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 December 31, 2014 is as follows (in millions):
| Risk Solutions |  | HR Solutions |  | Total
2015 | $ | 113 |  |  | $ | 209 |  |  | $ | 322 |
2016 | 103 |  |  | 175 |  |  | 278 |
2017 | 93 |  |  | 139 |  |  | 232 |
2018 | 80 |  |  | 92 |  |  | 172 |
2019 | 69 |  |  | 74 |  |  | 143 |
Thereafter | 186 |  |  | 168 |  |  | 354 |
| $ | 644 |  |  | $ | 857 |  |  | $ | 1,501 |

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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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