v3.26.1
Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Pre-tax AOCI loss $ (2,302) $ (2,057) $ (3,053) $ (3,912)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 10      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (121)      
Pre-tax net income related to amortization of discontinued cash flow hedges 2      
Maximum potential future exposure on swap participations 596      
Aggregate fair value of all derivative instruments with credit risk 104 54    
Posted collateral related to derivative instruments with credit risk 121 51    
Hedged Asset, Fair Value Hedge, Portfolio method, Amount 3,400 2,500    
Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost 6,500 6,100    
Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) 23      
Debt Available-for-Sale Securities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 29      
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Pre-tax AOCI loss $ (213) $ (91) $ (323) $ (662)