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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
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 | 4,459 |  | 4,459 |  | 4,542
Intangible assets with finite lives, Accumulated Amortization | 2,202 |  | 2,202 |  | 2,022
Intangible assets, Net Carrying Amount | 2,257 |  | 2,257 |  | 2,520
Amortization expense on intangible assets | 78 | $ 90 | 237 | $ 263 |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2015 | 79 |  | 79 |  |
2016 | 272 |  | 272 |  |
2017 | 228 |  | 228 |  |
2018 | 169 |  | 169 |  |
2019 | 140 |  | 140 |  |
Thereafter | 350 |  | 350 |  |
Total | 1,238 |  | 1,238 |  |
Risk Solutions [Member] |  |  |  |  |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2015 | 51 |  | 51 |  |
2016 | 172 |  | 172 |  |
2017 | 137 |  | 137 |  |
2018 | 91 |  | 91 |  |
2019 | 72 |  | 72 |  |
Thereafter | 164 |  | 164 |  |
Total | 687 |  | 687 |  |
HR Solutions [Member] |  |  |  |  |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2015 | 28 |  | 28 |  |
2016 | 100 |  | 100 |  |
2017 | 91 |  | 91 |  |
2018 | 78 |  | 78 |  |
2019 | 68 |  | 68 |  |
Thereafter | 186 |  | 186 |  |
Total | 551 |  | 551 |  |
Customer related and contract based [Member] |  |  |  |  |
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 2,899 |  | 2,899 |  | 2,952
Intangible assets with finite lives, Accumulated Amortization | 1,753 |  | 1,753 |  | 1,579
Intangible assets, Net Carrying Amount | 1,146 |  | 1,146 |  | 1,373
Technology and other [Member] |  |  |  |  |
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 541 |  | 541 |  | 571
Intangible assets with finite lives, Accumulated Amortization | 449 |  | 449 |  | 443
Intangible assets, Net Carrying Amount | $ 92 |  | $ 92 |  | $ 128

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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=56944662&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=26713463&loc=d3e16323-109275 + Details
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