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Intangible Assets - Schedule Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 756 $ 292
Accumulated Amortization (131) (5)
Net Carrying Value 625 287
Core Deposits    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 700 250
Accumulated Amortization (113) (4)
Net Carrying Value 587 246
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 56 42
Accumulated Amortization (18) (1)
Net Carrying Value $ 38 $ 41