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Capital and Mandatorily Redeemable Capital Stock (MRCS) Stockholder Concentration (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Concentration Risk [Line Items]    
Amount of Which is Classified as a Liability (MRCS) $ 83 $ 83
Stockholders' Equity, Total [Member] | The Northern Trust Company    
Concentration Risk [Line Items]    
Regulatory Capital Stock Outstanding 343  
Amount of Which is Classified as a Liability (MRCS) $ 0  
Stockholders' Equity, Total [Member] | The Northern Trust Company | FHLBank Chicago Capital Concentration Risk    
Concentration Risk [Line Items]    
% of Total Outstanding 10.40%