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Fair Value Measures - Quantitative Information about Recurring Level 3 Fair Value Financial Instruments (Details)
$ in Millions
Jun. 30, 2024
USD ($)
$ / loan
Year
Dec. 31, 2023
USD ($)
$ / loan
Year
Jun. 30, 2023
USD ($)
Assets:      
Mortgage servicing rights $ 1,122 $ 1,111 $ 1,031
Private label collateralized mortgage obligations      
Assets:      
Fair Value 168 180  
Recurring      
Assets:      
Mortgage servicing rights 1,122 1,111  
Recurring | Private label collateralized mortgage obligations      
Assets:      
Fair Value 168 180  
Recurring | Rate lock commitments      
Liabilities:      
Rate lock commitments (net) 5 3  
Significant Unobservable Inputs (Level 3) | Recurring      
Assets:      
Mortgage servicing rights 1,122 1,111  
Significant Unobservable Inputs (Level 3) | Recurring | Private label collateralized mortgage obligations      
Assets:      
Fair Value 33 32  
Significant Unobservable Inputs (Level 3) | Recurring | Rate lock commitments      
Liabilities:      
Rate lock commitments (net) $ 5 $ 3  
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Minimum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.047 0.050  
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Maximum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.216 0.217  
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Weighted average | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.051 0.054  
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Minimum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0 0  
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Maximum | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.103 0.100  
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Weighted average | Recurring | Valuation Technique, Discounted Cash Flow      
Assets:      
Mortgage servicing rights, measurement input 0.079 0.079  
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 | $ / loan 65 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 | $ / loan 90 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 | $ / loan 68 69  
Significant Unobservable Inputs (Level 3) | Constant default rates | Minimum | Recurring | Valuation Technique, Discounted Cash Flow | Private label collateralized mortgage obligations      
Assets:      
Fair value, measurement input 0.0010 0.0010  
Significant Unobservable Inputs (Level 3) | Constant default rates | Maximum | Recurring | Valuation Technique, Discounted Cash Flow | Private label collateralized mortgage obligations      
Assets:      
Fair value, measurement input 0.0020 0.0030  
Significant Unobservable Inputs (Level 3) | Weighted average life | Minimum | Recurring | Valuation Technique, Discounted Cash Flow | Private label collateralized mortgage obligations      
Assets:      
Fair value, measurement input | Year 0.0788 0.082  
Significant Unobservable Inputs (Level 3) | Weighted average life | Maximum | Recurring | Valuation Technique, Discounted Cash Flow | Private label collateralized mortgage obligations      
Assets:      
Fair value, measurement input | Year 0.1130 0.118  
Significant Unobservable Inputs (Level 3) | Origination pull-through rate | Recurring | Rate lock commitments | Valuation Technique, Consensus Pricing Model      
Liabilities:      
Rate lock commitments (net), measurement input 0.6910 0.6430  
Significant Unobservable Inputs (Level 3) | Rate lock commitments | Recurring | Rate lock commitments      
Liabilities:      
Rate lock commitments (net) $ 4 $ 9