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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost |  | $ 2,313 | $ 2,229
Accumulated Amortization |  | 849 | 792
Net Carrying Amount |  | 1,464 | 1,437
Client relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost |  | 2,046 | 1,970
Accumulated Amortization |  | 685 | 639
Net Carrying Amount |  | 1,361 | 1,331
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost | [1] | 267 | 259
Accumulated Amortization | [1] | 164 | 153
Net Carrying Amount | [1] | $ 103 | $ 106
[1] | Primarily non-compete agreements, trade names and developed technology.

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