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Fair Value Measures - Quantitative Information about Recurring Level 3 Fair Value Financial Instruments (Details)
$ in Millions
Sep. 30, 2024
USD ($)
$ / loan
Year
Dec. 31, 2023
USD ($)
$ / loan
Year
Assets:    
Mortgage servicing rights $ 0 $ 1,111
Private label collateralized mortgage obligations    
Assets:    
Fair Value 172 180
Recurring    
Assets:    
Mortgage servicing rights 1,105 1,111
Recurring | Private label collateralized mortgage obligations    
Assets:    
Fair Value 172 180
Recurring | Rate lock commitments    
Liabilities:    
Rate lock commitments (net) 3 3
Significant Unobservable Inputs (Level 3) | Recurring    
Assets:    
Mortgage servicing rights 1,105 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) $ 3 $ 3
Significant Unobservable Inputs (Level 3) | Option adjusted spread | Minimum | Recurring | Valuation Technique, Discounted Cash Flow    
Assets:    
Mortgage servicing rights, measurement input 0.046 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 0.050 0.054
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Minimum | Recurring | Valuation Technique, Discounted Cash Flow    
Assets:    
Mortgage servicing rights, measurement input 0.000 0.000
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Maximum | Recurring | Valuation Technique, Discounted Cash Flow    
Assets:    
Mortgage servicing rights, measurement input 0.100 0.100
Significant Unobservable Inputs (Level 3) | Constant prepayment rate | Weighted average | Recurring | Valuation Technique, Discounted Cash Flow    
Assets:    
Mortgage servicing rights, measurement input 0.083 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 0.081 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 0.123 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 0.5020 0.6430
Significant Unobservable Inputs (Level 3) | Rate lock commitments | Recurring | Rate lock commitments    
Liabilities:    
Rate lock commitments (net) $ 8 $ 9