v3.25.4
Fair Value Measurements, Valuation Techniques - Recurring Basis (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
$ / loan
Dec. 31, 2024
USD ($)
$ / loan
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Servicing Asset, Fair Value by Fair Value Hierarchy Level [Extensible Enumeration] Fair value, inputs, level 3 [Member] Fair value, inputs, level 3 [Member]
Fair value, recurring [Member] | Total Consumer [Member] | Residential mortgage [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Mortgage servicing rights $ 5,696 $ 6,844
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Measurement input, cost to service per loan [Member] | Minimum [Member] | Non modified loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input | $ / loan 61 60
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Measurement input, cost to service per loan [Member] | Maximum [Member] | Non modified loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input | $ / loan 112 162
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Derivative Asset (Liability) Net, Valuation Technique [Extensible Enumeration] Valuation technique, discounted cash flow [Member] Valuation technique, discounted cash flow [Member]
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, discount rate [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Net derivative assets and (liabilities) $ (139) $ (3,588)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, discount rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.025 0.041
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, discount rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.035 0.042
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, discount rate [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.034 0.041
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, default rate [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Net derivative assets and (liabilities) $ (3) $ (15)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, default rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.004 0.004
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, default rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.120 0.011
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, default rate [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.024 0.005
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, loss severity [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.500 0.500
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, loss severity [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.500 0.500
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member] | Measurement input, loss severity [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.500 0.500
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Net derivative assets and (liabilities) $ (579) $ (758)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member] | Measurement input, conversion factor [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input (0.003) (0.014)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member] | Measurement input, conversion factor [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.000 0.000
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member] | Measurement input, conversion factor [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input (0.002) (0.007)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member] | Measurement input, weighted average life [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), term of contract 1 year 1 year
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member] | Measurement input, weighted average life [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), term of contract 4 years 4 years
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, discounted cash flow [Member] | Measurement input, weighted average life [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), term of contract 1 year 8 months 12 days 2 years
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Net derivative assets and (liabilities) $ (545) $ (409)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member] | Measurement input, correlation factor [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input (0.200) (0.700)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member] | Measurement input, correlation factor [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.985 0.989
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member] | Measurement input, correlation factor [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.771 0.653
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member] | Measurement input, volatility factor [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.080 0.065
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member] | Measurement input, volatility factor [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 1.050 1.380
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member] | Valuation technique, option model [Member] | Measurement input, volatility factor [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Net derivative assets and (liabilities), measurement input 0.427 0.411
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Mortgage servicing rights $ 5,696 $ 6,844
Servicing Asset, Valuation Technique [Extensible Enumeration] Valuation technique, discounted cash flow [Member] Valuation technique, discounted cash flow [Member]
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, cost to service per loan [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input | $ / loan 61 60
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, cost to service per loan [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input | $ / loan 446 451
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, cost to service per loan [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input | $ / loan 96 103
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, discount rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input 0.088 0.092
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, discount rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input 0.125 0.155
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, discount rate [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input 0.091 0.101
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, prepayment rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input 0.057 0.068
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, prepayment rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input 0.230 0.194
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Total Consumer [Member] | Residential mortgage [Member] | Measurement input, prepayment rate [Member] | Weighted average [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Abstract]    
Mortgage servicing rights, measurement input 0.080 0.081