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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss $ (2,220) $ (2,631) $ (3,912) $ (2,540) $ (4,379) $ (3,773)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 14          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (111)          
Pre-tax net income related to amortization of discontinued cash flow hedges 5          
Maximum potential future exposure on swap participations 573          
Aggregate fair value of all derivative instruments with credit risk 47   47      
Posted collateral related to derivative instruments with credit risk 42   34      
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss $ (43) $ (121) $ (662) $ (118) $ (703) $ (399)