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Intangible Assets - Schedule Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 756 $ 756
Accumulated Amortization (166) (131)
Net Carrying Value 590 625
Core Deposits    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 700 700
Accumulated Amortization (143) (113)
Net Carrying Value 557 587
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 56 56
Accumulated Amortization (23) (18)
Net Carrying Value $ 33 $ 38