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Derivative Financial Instruments And Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss $ (2,631) $ (3,053) $ (3,912) $ (4,379) $ (4,325) $ (3,773)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax 20          
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months (155)          
Pre-tax net income related to amortization of discontinued cash flow hedges 11          
Derivative, Notional Amount 163,756   163,738      
Maximum potential future exposure on swap participations 534          
Aggregate fair value of all derivative instruments with credit risk 47   47      
Posted collateral related to derivative instruments with credit risk 43   34      
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Pre-tax AOCI loss (121) $ (323) (662) $ (703) $ (689) $ (399)
Not Designated as Hedging Instrument            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative, Notional Amount $ 120,221   $ 119,594