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Derivatives and Hedging Activities Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Advances [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Fair Value Hedge $ 18,330 $ 14,806
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 557 146
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 22 10
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 579 156
Available-for-sale Securities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Fair Value Hedge 6,539 6,221
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 458 167
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 0 0
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 458 167
Consolidated Obligation Bonds [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Liability, Fair Value Hedge 16,339 20,256
Hedged Liability, Active Fair Value Hedge, Cumulative Increase (Decrease) 247 16
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 234 1
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) $ (13) $ (15)