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Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Derivative [Line Items]        
Reclassified terminated cash flow hedges net losses   $ 31    
Oci Cash Flow Hedge Reclassification For Discontinuance, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag     reclassified from AOCI  
Cash flow hedge gain (loss) to be reclassified within twelve months     $ 42  
Maximum length of time hedged in cash flow hedge     5 years  
Cash flow hedge loss to be reclassified within twelve months related to terminated hedges   (48) $ (48)  
Fair value of derivative liabilities   14,261 14,261 $ 29,124
Forecast        
Derivative [Line Items]        
Reclassified terminated cash flow hedges net losses $ 29      
Interest rate swap | Fair Value Hedges        
Derivative [Line Items]        
Notional amount of derivative instruments   36,120 36,120 $ 31,120
Credit swap agreements        
Derivative [Line Items]        
Fair value of derivative liabilities   3,490 3,490  
Cash collateral provided for derivative instruments   1,840 1,840  
Maximum additional amount of payments related to termination events   $ 1,650 $ 1,650