v3.26.1
Fair Value (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Fair Value [Member]        
Assets        
Cash and due from banks $ 58 $ 44    
Interest-bearing deposits 5,213 3,726    
Securities purchased under agreements to resell 19,300 17,090    
Federal funds sold 12,050 5,930    
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged) 6,067 6,303    
Debt Securities, Available-for-sale 28,775 27,519    
Held-to-Maturity Securities, Fair Value 415 452    
Advances 124,606 110,441    
Mortgage loans held for portfolio, net 14,909 14,034    
Accrued interest receivable 508 461    
Derivative assets, net 88 80    
Other assets 54 50    
Liabilities        
Deposits (1,339) (1,147)    
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure (197,460) (173,448)    
Mandatorily redeemable capital stock (59) (30)    
Accrued interest payable (677) (589)    
Derivative liabilities, net (7) (3)    
Reported Value Measurement [Member]        
Assets        
Cash and due from banks 58 44    
Interest-bearing deposits 5,213 3,726    
Securities purchased under agreements to resell 19,300 17,090    
Federal funds sold 12,050 5,930    
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged) 6,067 6,303    
Debt Securities, Available-for-sale 28,775 27,519    
Held-to-maturity securities 413 447    
Advances 124,489 110,230    
Mortgage loans held for portfolio, net 15,518 14,540    
Accrued interest receivable 508 461    
Derivative assets, net 88 80    
Other assets 54 50    
Liabilities        
Deposits (1,339) (1,147)    
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure (198,104) (173,869)    
Mandatorily redeemable capital stock (59) (30)    
Accrued interest payable (677) (589)    
Derivative liabilities, net (7) (3)    
Cash and due from banks 58 44    
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged) 6,067 6,303    
Held-to-Maturity Securities, Fair Value 415 452    
Loans to Other Federal Home Loan Banks 0 0 $ 0 $ 0
Accrued interest receivable 508 461    
Derivative assets, net 88 80    
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset (181) (160)    
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset 45 26    
Mandatorily redeemable capital stock (59) (30)    
Accrued interest payable (677) (589)    
Derivative liabilities, net (7) (3)    
Loans from Other Federal Home Loan Banks     0 0
Federal Home Loan Bank of Cincinnati        
Liabilities        
Loans from Other Federal Home Loan Banks     $ 0 $ 0
Fair Value, Level 1 [Member]        
Assets        
Cash and due from banks 58 44    
Interest-bearing deposits 0 0    
Securities purchased under agreements to resell 0 0    
Federal funds sold 0 0    
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged) 0 0    
Debt Securities, Available-for-sale 0 0    
Held-to-Maturity Securities, Fair Value 0 0    
Advances 0 0    
Mortgage loans held for portfolio, net 0 0    
Accrued interest receivable 0 0    
Derivative assets, net 0 0    
Other assets 54 50    
Liabilities        
Deposits 0 0    
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure 0 0    
Mandatorily redeemable capital stock (59) (30)    
Accrued interest payable 0 0    
Derivative liabilities, net 0 0    
Fair Value, Level 2 [Member]        
Assets        
Cash and due from banks 0 0    
Interest-bearing deposits 5,213 3,726    
Securities purchased under agreements to resell 19,300 17,090    
Federal funds sold 12,050 5,930    
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged) 6,067 6,303    
Debt Securities, Available-for-sale 28,775 27,519    
Held-to-Maturity Securities, Fair Value 413 450    
Advances 124,606 110,441    
Mortgage loans held for portfolio, net 14,864 13,996    
Accrued interest receivable 508 461    
Derivative assets, net 269 240    
Other assets 0 0    
Liabilities        
Deposits (1,339) (1,147)    
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure (197,460) (173,448)    
Mandatorily redeemable capital stock 0 0    
Accrued interest payable (677) (589)    
Derivative liabilities, net (52) (29)    
Fair Value, Level 3 [Member]        
Assets        
Cash and due from banks 0 0    
Interest-bearing deposits 0 0    
Securities purchased under agreements to resell 0 0    
Federal funds sold 0 0    
Trading securities (includes $1,515 and $1,390 pledged as collateral that may be repledged) 0 0    
Debt Securities, Available-for-sale 0 0    
Held-to-Maturity Securities, Fair Value 2 2    
Advances 0 0    
Mortgage loans held for portfolio, net 45 38    
Accrued interest receivable 0 0    
Derivative assets, net 0 0    
Other assets 0 0    
Liabilities        
Deposits 0 0    
Federal Home Loan Bank, Consolidated Obligations Fair Value Disclosure 0 0    
Mandatorily redeemable capital stock 0 0    
Accrued interest payable 0 0    
Derivative liabilities, net 0 0    
Consolidated Obligation Discount Notes [Member] | Fair Value [Member]        
Liabilities        
Discount notes (97,318) (84,617)    
Consolidated Obligation Discount Notes [Member] | Reported Value Measurement [Member]        
Liabilities        
Discount notes (97,342) (84,620)    
Consolidated Obligation Discount Notes [Member] | Fair Value Option Election        
Liabilities        
Discount notes 4,755 17,382    
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 1 [Member]        
Liabilities        
Discount notes 0 0    
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 2 [Member]        
Liabilities        
Discount notes (97,318) (84,617)    
Consolidated Obligation Discount Notes [Member] | Fair Value, Level 3 [Member]        
Liabilities        
Discount notes 0 0    
Consolidated Obligation Bonds [Member] | Fair Value [Member]        
Liabilities        
Bonds, Fair Value (100,142) (88,831)    
Consolidated Obligation Bonds [Member] | Reported Value Measurement [Member]        
Liabilities        
Bonds, Fair Value (100,762) (89,249)    
Consolidated Obligation Bonds [Member] | Fair Value, Level 1 [Member]        
Liabilities        
Bonds, Fair Value 0 0    
Consolidated Obligation Bonds [Member] | Fair Value, Level 2 [Member]        
Liabilities        
Bonds, Fair Value (100,142) (88,831)    
Consolidated Obligation Bonds [Member] | Fair Value, Level 3 [Member]        
Liabilities        
Bonds, Fair Value $ 0 $ 0