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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance | $ 1,183 | $ 1,133 |
Acquisitions |  | 98 |
Dispositions | (6) | (10) |
Impairment | (24) | (24) |
Reclassifications |  | 0 |
Other (primarily Fx) | (10) | (14) |
Ending balance | 1,167 | 1,183 | $ 1,133
Finite-lived Intangible Assets, Accumulated Amortization [Roll Forward] |  |  |
Accumulated amortization, beginning balance | 391 | 324 |
Current year amortization | 98 | 96 | 67
Dispositions | (6) | (7) |
Impairment |  | (12) |
Reclassifications | 0 | 0 |
Other (primarily Fx) | 10 | (10) |
Accumulated amortization, ending balance | 493 | 391 | 324
Net definite-lived intangibles | 674 | 792 |
Databases and software |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance | 506 | 510 |
Acquisitions |  | 0 |
Dispositions | (4) | 0 |
Impairment |  | (2) |
Reclassifications |  | 0 |
Other (primarily Fx) | 52 | (2) |
Ending balance | 554 | 506 | 510
Finite-lived Intangible Assets, Accumulated Amortization [Roll Forward] |  |  |
Accumulated amortization, beginning balance | 132 | 88 |
Current year amortization | 52 | 47 |
Dispositions | (3) | 0 |
Impairment |  | (2) |
Reclassifications | 2 | 2 |
Other (primarily Fx) | 4 | (3) |
Accumulated amortization, ending balance | 187 | 132 | 88
Net definite-lived intangibles | 367 | 374 |
Content |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance | 139 | 139 |
Acquisitions |  | 0 |
Dispositions | 0 | 0 |
Impairment |  | 0 |
Reclassifications |  | 0 |
Other (primarily Fx) | 0 | 0 |
Ending balance | 139 | 139 | 139
Finite-lived Intangible Assets, Accumulated Amortization [Roll Forward] |  |  |
Accumulated amortization, beginning balance | 87 | 73 |
Current year amortization | 14 | 14 |
Dispositions | 0 | 0 |
Impairment |  | 0 |
Reclassifications | 0 | 0 |
Other (primarily Fx) | 0 | 0 |
Accumulated amortization, ending balance | 101 | 87 | 73
Net definite-lived intangibles | 38 | 52 |
Customer relationships |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance | 330 | 168 |
Acquisitions |  | 0 |
Dispositions | (2) | 0 |
Impairment |  | 0 |
Reclassifications |  | 165 |
Other (primarily Fx) | 19 | (3) |
Ending balance | 347 | 330 | 168
Finite-lived Intangible Assets, Accumulated Amortization [Roll Forward] |  |  |
Accumulated amortization, beginning balance | 84 | 60 |
Current year amortization | 22 | 21 |
Dispositions | (2) | 0 |
Impairment |  | 0 |
Reclassifications | 1 | 5 |
Other (primarily Fx) | 1 | (2) |
Accumulated amortization, ending balance | 106 | 84 | 60
Net definite-lived intangibles | 241 | 246 |
Tradenames |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance | 45 | 47 |
Acquisitions |  | 0 |
Dispositions | 0 | (2) |
Impairment |  | 0 |
Reclassifications |  | 1 |
Other (primarily Fx) | 5 | (1) |
Ending balance | 50 | 45 | 47
Finite-lived Intangible Assets, Accumulated Amortization [Roll Forward] |  |  |
Accumulated amortization, beginning balance | 36 | 36 |
Current year amortization | 4 | 2 |
Dispositions | 0 | (1) |
Impairment |  | 0 |
Reclassifications | 1 | 0 |
Other (primarily Fx) | 1 | (1) |
Accumulated amortization, ending balance | 42 | 36 | 36
Net definite-lived intangibles | 8 | 9 |
Other intangibles |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance | 163 | 269 |
Acquisitions |  | 98 |
Dispositions | 0 | (8) |
Impairment |  | (22) |
Reclassifications |  | (166) |
Other (primarily Fx) | (86) | (8) |
Ending balance | 77 | 163 | 269
Finite-lived Intangible Assets, Accumulated Amortization [Roll Forward] |  |  |
Accumulated amortization, beginning balance | 52 | 67 |
Current year amortization | 6 | 12 |
Dispositions | (1) | (6) |
Impairment |  | (10) |
Reclassifications | (4) | (7) |
Other (primarily Fx) | 4 | (4) |
Accumulated amortization, ending balance | 57 | 52 | $ 67
Net definite-lived intangibles | $ 20 | $ 111 |

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