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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Gross Carrying Amount $ 452 $ 455
Accumulated Amortization 397 361
Core deposit intangibles    
Goodwill [Line Items]    
Gross Carrying Amount 356 355
Accumulated Amortization 326 303
PCCR intangibles    
Goodwill [Line Items]    
Gross Carrying Amount 16 16
Accumulated Amortization 15 14
Other intangible assets    
Goodwill [Line Items]    
Gross Carrying Amount 80 84
Accumulated Amortization $ 56 $ 44