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Intangible Assets - Schedule Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 756 $ 756
Accumulated Amortization (199) (131)
Net Carrying Value 557 625
Core deposit intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 700 700
Accumulated Amortization (172) (113)
Net Carrying Value 528 587
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 56 56
Accumulated Amortization (27) (18)
Net Carrying Value $ 29 $ 38