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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2016
Business Acquisition [Line Items] |
Acquisition of Businesses | 2016 Acquisitions
| Purchase Consideration |  | Total Net Assets (Liabilities) Acquired |  | Total Net Deferred Tax Liability |  | Acquired Intangible Assets |  | Goodwill
| (in millions)
ISE | $ | 1,070 |  |  | $ | 83 |  |  | $ | (185 | ) |  | $ | 623 |  |  | $ | 549 |
Boardvantage | 242 |  |  | 28 |  |  | (45 | ) |  | 111 |  |  | 148 |
Marketwired | 111 |  |  | (1 | ) |  | (5 | ) |  | 31 |  |  | 86 |
Nasdaq CXC | 116 |  |  | 6 |  |  | (20 | ) |  | 76 |  |  | 54 |
Acquired infinite lived intangible assets in acquisition | The following table presents the details of acquired intangible assets in our 2016 and 2015 acquisitions. All acquired intangible assets with finite lives are amortized using the straight-line method.
| 2016 |  | 2015
| ISE |  | Boardvantage |  | Marketwired |  | Nasdaq CXC |  | DWA
| ($ in millions)
Intangible Assets |  |  |  |  |  |  |  |  |
Exchange registrations | $ | 467 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Discount rate used | 8.6 | % |  | — |  |  | — |  |  | — |  |  | — |
Estimated average remaining useful life | Indefinite |  |  | — |  |  | — |  |  | — |  |  | — |
Customer relationships | $ | 148 |  |  | $ | 103 |  |  | $ | 29 |  |  | $ | 76 |  |  | $ | 29 |
Discount rate used | 9.1 | % |  | 15.5 | % |  | 16.4 | % |  | 10.3 | % |  | 17.5 | %
Estimated average remaining useful life | 13 years |  |  | 14 years |  |  | 6 years |  |  | 17 years |  |  | 15 years |
Trade name | $ | 8 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 108 |
Discount rate used | 8.6 | % |  | 15.0 | % |  | 15.8 | % |  | — |  |  | 17.0 | %
Estimated average remaining useful life | Indefinite |  |  | 1 year |  |  | 2 years |  |  | — |  |  | Indefinite |
Technology | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Discount rate used | — |  |  | 15.5 | % |  | — |  |  | — |  |  | 17.0 | %
Estimated average remaining useful life | — |  |  | 5 years |  |  | — |  |  | — |  |  | 5 years |
Total intangible assets | $ | 623 |  |  | $ | 111 |  |  | $ | 31 |  |  | $ | 76 |  |  | $ | 141 |
Acquired finite lived intangible assets in acquisition | The following table presents the details of acquired intangible assets in our 2016 and 2015 acquisitions. All acquired intangible assets with finite lives are amortized using the straight-line method.
| 2016 |  | 2015
| ISE |  | Boardvantage |  | Marketwired |  | Nasdaq CXC |  | DWA
| ($ in millions)
Intangible Assets |  |  |  |  |  |  |  |  |
Exchange registrations | $ | 467 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Discount rate used | 8.6 | % |  | — |  |  | — |  |  | — |  |  | — |
Estimated average remaining useful life | Indefinite |  |  | — |  |  | — |  |  | — |  |  | — |
Customer relationships | $ | 148 |  |  | $ | 103 |  |  | $ | 29 |  |  | $ | 76 |  |  | $ | 29 |
Discount rate used | 9.1 | % |  | 15.5 | % |  | 16.4 | % |  | 10.3 | % |  | 17.5 | %
Estimated average remaining useful life | 13 years |  |  | 14 years |  |  | 6 years |  |  | 17 years |  |  | 15 years |
Trade name | $ | 8 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 108 |
Discount rate used | 8.6 | % |  | 15.0 | % |  | 15.8 | % |  | — |  |  | 17.0 | %
Estimated average remaining useful life | Indefinite |  |  | 1 year |  |  | 2 years |  |  | — |  |  | Indefinite |
Technology | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Discount rate used | — |  |  | 15.5 | % |  | — |  |  | — |  |  | 17.0 | %
Estimated average remaining useful life | — |  |  | 5 years |  |  | — |  |  | — |  |  | 5 years |
Total intangible assets | $ | 623 |  |  | $ | 111 |  |  | $ | 31 |  |  | $ | 76 |  |  | $ | 141 |
DWA |
Business Acquisition [Line Items] |
Acquisition of Businesses | We completed the following acquisitions in 2015. Financial results are included in our Consolidated Statements of Income from the date of each acquisition.
| Purchase Consideration |  | Total Net Assets Acquired |  | Total Net Deferred Tax Liability |  | Acquired Intangible Assets |  | Goodwill
| (in millions)
DWA | $ | 226 |  |  | $ | 8 |  |  | $ | (34 | ) |  | $ | 141 |  |  | $ | 111 |

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