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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost |  | $ 1,941 | $ 1,906
Accumulated Amortization |  | 685 | 632
Net Carrying Amount |  | 1,256 | 1,274
Client relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost |  | 1,700 | 1,672
Accumulated Amortization |  | 560 | 518
Net Carrying Amount |  | 1,140 | 1,154
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Cost | [1] | 241 | 234
Accumulated Amortization | [1] | 125 | 114
Net Carrying Amount | [1] | $ 116 | $ 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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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