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Fair Value Measures - Quantitative Information about Recurring Level 3 Fair Value Financial Instruments (Details)
$ in Millions
Mar. 31, 2024
USD ($)
constant_default_rate_per_loan
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Assets:      
Mortgage servicing rights | $ $ 1,092 $ 1,111 $ 1,034
Private Label CMOs      
Assets:      
Fair Value | $ 176 180  
Recurring      
Assets:      
Mortgage servicing rights | $ 1,092 1,111  
Recurring | Private Label CMOs      
Assets:      
Fair Value | $ 176 180  
Recurring | Rate lock commitments      
Liabilities:      
Rate lock commitments (net) | $ 3 3  
Significant Unobservable Inputs (Level 3) | Recurring      
Assets:      
Mortgage servicing rights | $ 1,092 1,111  
Significant Unobservable Inputs (Level 3) | Recurring | Private Label CMOs      
Assets:      
Fair Value | $ 33 32  
Significant Unobservable Inputs (Level 3) | Recurring | Rate lock commitments      
Liabilities:      
Rate lock commitments (net) | $ $ 3 $ 3  
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Minimum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.049    
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Maximum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.217    
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Weighted average | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.053    
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Minimum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0    
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Maximum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.100    
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Weighted average | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.077    
Significant Unobservable Inputs (Level 3) | Weighted average cost to service per loan | Minimum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 65    
Significant Unobservable Inputs (Level 3) | Weighted average cost to service per loan | Maximum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 90    
Significant Unobservable Inputs (Level 3) | Weighted average cost to service per loan | Weighted average | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 68    
Significant Unobservable Inputs (Level 3) | Constant default rates | Minimum | Recurring | Valuation Technique, Discounted Cash Flow | Private Label CMOs      
Assets:      
Fair value, measurement input 0.0010    
Significant Unobservable Inputs (Level 3) | Constant default rates | Maximum | Recurring | Valuation Technique, Discounted Cash Flow | Private Label CMOs      
Assets:      
Fair value, measurement input 0.0030    
Significant Unobservable Inputs (Level 3) | Measurement input, expected term | Minimum | Recurring | Valuation Technique, Discounted Cash Flow | Private Label CMOs      
Assets:      
Fair value, measurement input 0.1150    
Significant Unobservable Inputs (Level 3) | Measurement input, expected term | Maximum | Recurring | Valuation Technique, Discounted Cash Flow | Private Label CMOs      
Assets:      
Fair value, measurement input 0.0796    
Significant Unobservable Inputs (Level 3) | Measurement Input, Origination Pull-Through | Recurring | Rate lock commitments | Valuation Technique, Consensus Pricing Model      
Liabilities:      
Rate lock commitments (net), measurement input 0.7180    
Significant Unobservable Inputs (Level 3) | Rate lock commitments | Recurring | Rate lock commitments      
Liabilities:      
Rate lock commitments (net) | $ $ 8