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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets $ 181,000,000 $ 1,024,000,000
Mortgage servicing assets excluded from OREO 8,000,000 0
Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets 181,000,000 1,024,000,000
Other investments 63,000,000 77,000,000
Fair Value, Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral dependent loans 104,000,000 17,000,000
Level 3 | Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets 0 3,000,000
Insignificant level 3 assets, net of liabilities 4,000,000 1,000,000
Other investments 2,000,000 3,000,000
Level 3 | Fair Value, Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral dependent loans 104,000,000 17,000,000
Principal investments: Direct | Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments 0 1,000,000
Principal investments: Direct | Level 3 | Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments 0 1,000,000
Market comparable pricing | Level 3 | Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential) 9,000,000 9,000,000
Fair value of underlying collateral | Level 3 | Fair Value, Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral dependent loans 104,000,000 17,000,000
Appraised value | Level 3 | Fair Value, Nonrecurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
OREO and other assets 21,000,000 14,000,000
Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets $ (2,000,000) $ 2,000,000
Comparability factor | Market comparable pricing | Level 3 | Fair Value, Recurring | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential), measurement input 0.6267 0.6100
Comparability factor | Market comparable pricing | Level 3 | Fair Value, Recurring | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential), measurement input 0.8960 0.8658
Comparability factor | Market comparable pricing | Level 3 | Fair Value, Recurring | Weighted-Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans, net of unearned income (residential), measurement input 0.7083 0.7221
Probability of default | Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.0002 0.0002
Probability of default | Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1 1
Probability of default | Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring | Weighted-Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.0530 0.0800
Loss given default | Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0 0
Loss given default | Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1 1
Loss given default | Interest rate | Discounted cash flows | Level 3 | Fair Value, Recurring | Weighted-Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.48 0.49
Credit and liquidity discount | Fair value of underlying collateral | Level 3 | Fair Value, Nonrecurring | Minimum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral dependent loans, measurement input 0 0
Credit and liquidity discount | Fair value of underlying collateral | Level 3 | Fair Value, Nonrecurring | Maximum    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral dependent loans, measurement input 0.1000 0.8500
Credit and liquidity discount | Fair value of underlying collateral | Level 3 | Fair Value, Nonrecurring | Weighted-Average    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral dependent loans, measurement input 0.0500 0.3400