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Derivatives and Hedging Activities Cumulative Basis Adjustments for FV Hedges (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Advances [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Fair Value Hedge $ 58,516 $ 57,580
Consolidated Obligation Bonds [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Liability, Fair Value Hedge 20,546 22,166
Available-for-Sale Securities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Fair Value Hedge 19,983 17,631
Consolidated Obligation Discount Notes [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Liability, Fair Value Hedge 61,439  
Consolidated Obligation Bonds [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Liability, Active Fair Value Hedge, Cumulative Increase (Decrease) 56 (21)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0 (1)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 56 (22)
Advances [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 82 (733)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (10) (28)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 72 (761)
Available-for-Sale Securities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) (315) (922)
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (42) (26)
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) (357) $ (948)
Consolidated Obligation Discount Notes [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Liability, Active Fair Value Hedge, Cumulative Increase (Decrease) 17  
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0  
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 17