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Intangible Assets - Schedule Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 751 $ 756
Accumulated Amortization (232) (131)
Net Carrying Value 519 625
Core deposit intangible    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 700 700
Accumulated Amortization (201) (113)
Net Carrying Value 499 587
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 51 56
Accumulated Amortization (31) (18)
Net Carrying Value $ 20 $ 38