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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Pre-tax AOCI loss $ (3,912,000,000) $ (3,773,000,000) $ (4,481,000,000) $ 387,000,000
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 29,000,000      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (203,000,000)      
Pre-tax net income related to amortization of discontinued cash flow hedges 30,000,000      
Derivative, Notional Amount 163,738,000,000 160,576,000,000    
Maximum potential future exposure on swap participations 320,000,000      
Aggregate fair value of all derivative instruments with credit risk 47,000,000 29,000,000    
Posted collateral related to derivative instruments with credit risk 34,000,000 32,000,000    
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Pre-tax AOCI loss (662,000,000) (399,000,000) $ (468,000,000) $ 830,000,000
Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 119,594,000,000 126,051,000,000    
Interest Rate Lock Commitments | Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 117,000,000 124,000,000    
Forward Sale Commitments | Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 308,000,000 267,000,000    
Forward Rate Commitments and Futures Contracts | Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount $ 3,400,000,000 $ 3,300,000,000