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Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 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 | 4,484 |  | 4,484 |  | 4,446
Intangible assets with finite lives, Accumulated Amortization | 2,377 |  | 2,377 |  | 2,266
Intangible assets, Net Carrying Amount | 2,107 |  | 2,107 |  | 2,180
Amortization expense on intangible assets | 68 | $ 79 | 135 | $ 159 |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2016 | 147 |  | 147 |  |
2017 | 228 |  | 228 |  |
2018 | 172 |  | 172 |  |
2019 | 145 |  | 145 |  |
2020 | 123 |  | 123 |  |
Thereafter | 273 |  | 273 |  |
Total | 1,088 |  | 1,088 |  |
Risk Solutions [Member] |  |  |  |  |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2016 | 44 |  | 44 |  |
2017 | 81 |  | 81 |  |
2018 | 73 |  | 73 |  |
2019 | 66 |  | 66 |  |
2020 | 58 |  | 58 |  |
Thereafter | 157 |  | 157 |  |
Total | 479 |  | 479 |  |
HR Solutions [Member] |  |  |  |  |
Estimated amortization for intangible assets |  |  |  |  |
Remainder of 2016 | 103 |  | 103 |  |
2017 | 147 |  | 147 |  |
2018 | 99 |  | 99 |  |
2019 | 79 |  | 79 |  |
2020 | 65 |  | 65 |  |
Thereafter | 116 |  | 116 |  |
Total | 609 |  | 609 |  |
Customer related and contract based [Member] |  |  |  |  |
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 2,923 |  | 2,923 |  | 2,886
Intangible assets with finite lives, Accumulated Amortization | 1,899 |  | 1,899 |  | 1,809
Intangible assets, Net Carrying Amount | 1,024 |  | 1,024 |  | 1,077
Technology and other [Member] |  |  |  |  |
Intangible assets with finite lives |  |  |  |  |
Intangible assets with finite lives, Gross Carrying Amount | 542 |  | 542 |  | 541
Intangible assets with finite lives, Accumulated Amortization | 478 |  | 478 |  | 457
Intangible assets, Net Carrying Amount | $ 64 |  | $ 64 |  | $ 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=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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