v3.26.1
Repurchase Agreements And Reverse Repurchase Agreements (Narrative) (Details)
$ in Millions
Jun. 30, 2026
USD ($)
days
Dec. 31, 2025
USD ($)
days
Assets Sold under Agreements to Repurchase [Line Items]    
Receivable Under Reverse Repurchase Agreements $ 18,433 $ 16,615
Securities Sold under Agreements to Repurchase 89,808 85,286
Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value $ 18,150 $ 16,452
Short-term Debt, Weighted Average Interest Rate, at Point in Time 3.75% 3.97%
Debt of consolidated variable interest entities, at fair value $ 0 $ (56)
TBA securities Fifteen Year and Thirty Year Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Derivative, Fair Value, Net 52 71
TBA and Forward Settling Agency Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Derivative, Forward Settlement Value 9,676 12,917
Derivative, Fair Value, Net 52 71
Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase 31,200 27,500
Maturity Overnight [Member] | US Treasury Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase 10,300 10,900
Forward Contracts [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold under Agreements to Repurchase $ 35,100 $ 24,700
Weighted Average Forward Start Days | days 1 2
Short-term Debt, Weighted Average Interest Rate, at Point in Time 3.71% 3.81%
Bethesda Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Percentage of Repurchase Agreement Funding 58.00% 57.00%
FICC [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Percentage of Repurchase Agreement Funding 44.00% 44.00%
Obligation to Return Securities Borrowed Under Reverse Repurchase Agreements at Fair Value $ 5,400 $ 5,200