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Goodwill and Other Intangible Assets - Summary of Intangible Assets and Accumulated Amortization Included in the Consolidated Statements of Condition (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 427 | $ 427
Accumulated Amortization | (252) | (241)
Net Carrying Value | 175 | 186
Core deposit intangibles |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 368 | 368
Accumulated Amortization | (218) | (208)
Net Carrying Value | 150 | 160
Client relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32 | 32
Accumulated Amortization | (16) | (16)
Net Carrying Value | 16 | 16
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27 | 27
Accumulated Amortization | (18) | (17)
Net Carrying Value | $ 9 | $ 10

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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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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