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Consolidated Obligations (Consolidated Obligation Bonds by Earlier of Contractual Maturity or Next Call Date) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total bonds, par value $ 77,907 $ 71,370
Earlier of Contractual Maturity or Next Call Date [Member]    
Debt Instrument [Line Items]    
Within 1 year 65,778 58,239
After 1 year through 2 years 11,620 12,768
After 2 years through 3 years 381 195
After 3 years through 4 years 40 70
After 4 years through 5 years 37 47
After 5 years $ 51 $ 51