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Activities with Stockholders (Transactions with Directors' Financial Institutions) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Related Party Transaction [Line Items]    
Advances $ 110,230 $ 99,951
Total deposits 1,147 1,314
Capital Stock 6,509 5,989
Conventional Mortgage Loans [Member]    
Related Party Transaction [Line Items]    
Financing Receivable, Past Due 14,185 11,531
Director [Member]    
Related Party Transaction [Line Items]    
Advances $ 667 $ 1,127
Advances, Percent 1.00% 1.00%
Mortgage Loans, Percent 4.00% 2.00%
Total deposits $ 15 $ 12
Deposits, Percent 1.00% 1.00%
Capital Stock $ 65 $ 78
Capital Stock, Percent 1.00% 1.00%
Director [Member] | Conventional Mortgage Loans [Member]    
Related Party Transaction [Line Items]    
Financing Receivable, Past Due $ 606 $ 190
Athene Annuity and Life Company    
Related Party Transaction [Line Items]    
Advances 23,271  
Athene Annuity and Life Company | Conventional Mortgage Loans [Member]    
Related Party Transaction [Line Items]    
Financing Receivable, Past Due $ 0