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Fair Value Measures - Roll Forward of Financial Instruments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2024
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Noninterest Income
Significant Unobservable Inputs (Level 3)  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at Beginning of Year $ 1,120
Total Gains / (Losses) Recorded in Earnings 7
Purchases / Originations 54
Sales (69)
Settlement 0
Transfers In (Out) 21
Balance at End of Year 1,133
Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at Beginning of Year 1,111
Total Gains / (Losses) Recorded in Earnings 8
Purchases / Originations 42
Sales (69)
Settlement 0
Transfers In (Out) 0
Balance at End of Year 1,092
Significant Unobservable Inputs (Level 3) | Private Label CMOs  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at Beginning of Year 0
Total Gains / (Losses) Recorded in Earnings 0
Purchases / Originations 0
Sales 0
Settlement 0
Transfers In (Out) 33
Balance at End of Year 33
Significant Unobservable Inputs (Level 3) | Rate lock commitments  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at Beginning of Year 9
Total Gains / (Losses) Recorded in Earnings (1)
Purchases / Originations 12
Sales
Settlement
Transfers In (Out) (12)
Balance at End of Year $ 8