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Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Cost | $ 3,823 | $ 3,874
Accumulated Amortization | 1,160 | 1,100
Net Carrying Amount | 2,663 | 2,774
Client relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Cost | 3,450 | 3,494
Accumulated Amortization | 951 | 897
Net Carrying Amount | 2,499 | 2,597
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Cost | 373 | 380
Accumulated Amortization | 209 | 203
Net Carrying Amount | $ 164 | $ 177

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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/disclosureRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: 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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