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Derivatives and Hedging Activities Cumulative adjustments table (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Advances  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Amortized Cost of Hedged Asset, Fair Value Hedge $ 32,880
Basis Adjustment for Active Fair Value Hedged Asset Cumulative Increase Decrease 804
Available-for-sale Securities  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Amortized Cost of Hedged Asset, Fair Value Hedge 14,195
Basis Adjustment for Active Fair Value Hedged Asset Cumulative Increase Decrease 1,275
Consolidated Obligations, Bonds  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Amortized Cost of Hedged Liability, Fair Value Hedge (2,707)
Basis Adjustment for Active Fair Value Hedged Liability Cumulative Increase Decrease (32)
Advances  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Basis Adjustment for Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 8
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 812
Available-for-sale Securities  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Basis Adjustment for Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 49
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 1,324
Consolidated Obligations, Bonds  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Basis Adjustment for Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ (32)