Allowance for Credit Losses Accrued Interest Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	$ 400	$ 377
MPF Loans held in portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	91	85
HTM securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	10	13
Available-for-sale debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	107	101
Interest-bearing deposits
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	8	8
Federal funds sold
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	1	1
Securities purchased under agreements to resell
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	3	3
Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	$ 180	$ 166