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Activities with Stockholders (Business Concentrations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Advances (Note 5) $ 110,230 $ 99,951  
Advances 5,070 6,009 $ 6,506
Residential Portfolio Segment      
Related Party Transaction [Line Items]      
Financing Receivable, Past Due 14,546 11,901  
Conventional Mortgage Loans [Member]      
Related Party Transaction [Line Items]      
Financing Receivable, Past Due 14,185 11,531  
Standby Letters of Credit [Member]      
Related Party Transaction [Line Items]      
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability 18,263 20,150  
Athene Annuity and Life Company      
Related Party Transaction [Line Items]      
Capital Stock Value Including Mandatorily Redeemable Stock 1,057    
Advances (Note 5) 23,271    
Advances $ 863    
Capital Stock Value Including Mandatorily Redeemable Stock Percent 16.00%    
Athene Annuity and Life Company | Conventional Mortgage Loans [Member]      
Related Party Transaction [Line Items]      
Financing Receivable, Past Due $ 0    
Wells FargoBank N.A.      
Related Party Transaction [Line Items]      
Capital Stock Value Including Mandatorily Redeemable Stock 741 711  
Advances (Note 5) 16,000 15,571  
Advances $ 348 $ 473  
Capital Stock Value Including Mandatorily Redeemable Stock Percent 11.00% 12.00%  
Standby letter of credit fees $ 13    
Wells FargoBank N.A. | Conventional Mortgage Loans [Member]      
Related Party Transaction [Line Items]      
Financing Receivable, Past Due 5    
Wells FargoBank N.A. | Standby Letters of Credit [Member]      
Related Party Transaction [Line Items]      
Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability 10,900    
Superior Guaranty Insurance Company      
Related Party Transaction [Line Items]      
Capital Stock Value Including Mandatorily Redeemable Stock 4    
Advances (Note 5) 0    
Advances $ 0    
Capital Stock Value Including Mandatorily Redeemable Stock Percent 0.00%    
Superior Guaranty Insurance Company | Conventional Mortgage Loans [Member]      
Related Party Transaction [Line Items]      
Financing Receivable, Past Due $ 93    
Principal Owner      
Related Party Transaction [Line Items]      
Capital Stock Value Including Mandatorily Redeemable Stock 1,802    
Advances (Note 5) 39,271    
Advances $ 1,211    
Capital Stock Value Including Mandatorily Redeemable Stock Percent 27.00%    
Principal Owner | Residential Portfolio Segment      
Related Party Transaction [Line Items]      
Financing Receivable, Past Due $ 98    
Credit Concentration Risk      
Related Party Transaction [Line Items]      
Segment Reporting, Disclosure of Major Customers no 1.0 billion 1.7 billion
Segment Reporting, Disclosure of Major Customers no 1.0 billion 1.7 billion
Stockholders' Equity, Total [Member] | Stockholders' Capital Stock Outstanding Concenetration Risk [Member] | Minimum [Member]      
Related Party Transaction [Line Items]      
Business Concentration Percentage 10.00%