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Derivatives and Hedging Activities Cumulative Basis Adjustments for FV Hedges (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Consolidated Obligation Bonds [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Hedged Liability, Fair Value Hedge $ 20,256
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 1
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (15)
Hedge Liability, Active Fair Value Hedge, Cumulative Increase (Decrease) 16
Advances [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Hedged Asset, Fair Value Hedge 14,806
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 146
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 10
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 156
Available-for-sale Securities [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Hedged Asset, Fair Value Hedge 6,221
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 167
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) $ 167