v3.26.1
Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss $ (2,574) $ (2,302) $ (2,057) $ (2,631) $ (3,053) $ (3,912)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 18          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (181)          
Pre-tax net income related to amortization of discontinued cash flow hedges (3)          
Maximum potential future exposure on swap participations 631          
Aggregate fair value of all derivative instruments with credit risk 51   54      
Posted collateral related to derivative instruments with credit risk 47   51      
Hedged Asset, Fair Value Hedge, Portfolio method, Amount 3,500   2,500      
Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost 6,300   6,100      
Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) 57          
Debt Available-for-Sale Securities            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 25          
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss $ (463) $ (213) $ (91) $ (121) $ (323) $ (662)