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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost |  | $ 2,083 | $ 1,906
Accumulated Amortization |  | 754 | 632
Net Carrying Amount |  | 1,329 | 1,274
Client relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost |  | 1,837 | 1,672
Accumulated Amortization |  | 611 | 518
Net Carrying Amount |  | 1,226 | 1,154
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost | [1] | 246 | 234
Accumulated Amortization | [1] | 143 | 114
Net Carrying Amount | [1] | $ 103 | $ 120
[1] | Primarily non-compete agreements, trade names and developed technology.

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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