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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Pre-tax AOCI loss $ (3,053,000,000) $ (3,912,000,000) $ (4,325,000,000) $ (3,773,000,000)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 19,000,000      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (168,000,000)      
Pre-tax net income related to amortization of discontinued cash flow hedges 20,000,000      
Derivative, Notional Amount 165,933,000,000 163,738,000,000    
Maximum potential future exposure on swap participations 418,000,000      
Aggregate fair value of all derivative instruments with credit risk 57,000,000 47,000,000    
Posted collateral related to derivative instruments with credit risk 50,000,000 34,000,000    
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Pre-tax AOCI loss (323,000,000)      
Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 121,464,000,000 119,594,000,000    
Interest Rate Lock Commitments | Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 194,000,000 117,000,000    
Forward Sale Commitments | Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount 368,000,000 308,000,000    
Forward Rate Commitments and Futures Contracts | Not Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative, Notional Amount $ 3,900,000,000 $ 3,400,000,000