v3.26.1
Fair Value Measurements - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets $ 368 $ 175
Mortgage servicing assets excluded from OREO 2  
Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets 368 175
Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral-dependent loans 116 56
Level 3 | Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets (1) (2)
Insignificant level 3 assets, net of liabilities 2 4
Level 3 | Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral-dependent loans 116 56
Market comparable pricing | Level 3 | Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential) $ 11 $ 11
Market comparable pricing | Level 3 | Recurring | Comparability factor | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential), measurement input 0.7130 0.7430
Market comparable pricing | Level 3 | Recurring | Comparability factor | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential), measurement input 0.9500 0.9900
Market comparable pricing | Level 3 | Recurring | Comparability factor | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential), measurement input 0.8458 0.8499
Discounted cash flow | Level 3 | Recurring | Interest rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets $ (2) $ (3)
Discounted cash flow | Level 3 | Recurring | Interest rate | Probability of default | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.0002 0.0002
Discounted cash flow | Level 3 | Recurring | Interest rate | Probability of default | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1 1
Discounted cash flow | Level 3 | Recurring | Interest rate | Probability of default | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.0480 0.0440
Discounted cash flow | Level 3 | Recurring | Interest rate | Loss given default | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0 0
Discounted cash flow | Level 3 | Recurring | Interest rate | Loss given default | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1 1
Discounted cash flow | Level 3 | Recurring | Interest rate | Loss given default | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.449 0.485
Fair value of collateral | Level 3 | Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral-dependent loans $ 116 $ 56
Fair value of collateral | Level 3 | Nonrecurring | Credit and liquidity discount | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral-dependent loans, measurement input 0 0
Fair value of collateral | Level 3 | Nonrecurring | Credit and liquidity discount | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral-dependent loans, measurement input 0.7200 1.0000
Fair value of collateral | Level 3 | Nonrecurring | Credit and liquidity discount | Weighted Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral-dependent loans, measurement input 0.2200 0.4000
Appraised value | Level 3 | Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
OREO and other Level 3 assets $ 10 $ 8