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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Intangible assets with indefinite lives |  |  |  |  |
Tradenames | $ 1,019 |  | $ 1,019 |  | $ 1,019
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 4,472 |  | 4,472 |  | 4,446
Intangible assets with finite lives, Accumulated Amortization | 2,434 |  | 2,434 |  | 2,266
Intangible assets, Net Carrying Amount | 2,038 |  | 2,038 |  | 2,180
Amortization of intangible assets | 72 | $ 78 | 207 | $ 237 |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2016 | 66 |  | 66 |  |
2017 | 233 |  | 233 |  |
2018 | 177 |  | 177 |  |
2019 | 149 |  | 149 |  |
2020 | 126 |  | 126 |  |
Thereafter | 268 |  | 268 |  |
Total | 1,019 |  | 1,019 |  |
Risk Solutions [Member] |  |  |  |  |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2016 | 26 |  | 26 |  |
2017 | 99 |  | 99 |  |
2018 | 87 |  | 87 |  |
2019 | 76 |  | 76 |  |
2020 | 66 |  | 66 |  |
Thereafter | 155 |  | 155 |  |
Total | 509 |  | 509 |  |
HR Solutions [Member] |  |  |  |  |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2016 | 40 |  | 40 |  |
2017 | 134 |  | 134 |  |
2018 | 90 |  | 90 |  |
2019 | 73 |  | 73 |  |
2020 | 60 |  | 60 |  |
Thereafter | 113 |  | 113 |  |
Total | 510 |  | 510 |  |
Customer related and contract based [Member] |  |  |  |  |
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 2,913 |  | 2,913 |  | 2,886
Intangible assets with finite lives, Accumulated Amortization | 1,945 |  | 1,945 |  | 1,809
Intangible assets, Net Carrying Amount | 968 |  | 968 |  | 1,077
Technology and other [Member] |  |  |  |  |
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 540 |  | 540 |  | 541
Intangible assets with finite lives, Accumulated Amortization | 489 |  | 489 |  | 457
Intangible assets, Net Carrying Amount | $ 51 |  | $ 51 |  | $ 84

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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