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Business Segments - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | segment 3    
Gain on sales of loans   $ 9  
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Expense    
Impairment charges     $ 63
Write Down of Leasehold Improvement Assets | 2020 - 2021 Restructuring Plan      
Segment Reporting Information [Line Items]      
Fixed asset impairment charges     $ 18
Lease Termination and Associated Costs      
Segment Reporting Information [Line Items]      
Impairment charges $ 22    
Group Reporting Basis Adjustments      
Segment Reporting Information [Line Items]      
Impairment reversal $ 149