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Mortgage Loans - Loans in Mortgage Portfolio (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Loans in Mortgage Portfolio [Line Items]      
Total unpaid principal balance of mortgage loans $ 3,989,480   $ 3,899,025
Cost basis and fair value adjustments, net 66,957   74,846
Allowance for loan losses for HFI loans (5,899)   (5,629)
Total mortgage loans 4,050,538   3,968,242
Lower of cost or fair value adjustment at time of redesignation (3) $ 57  
Single-family      
Loans in Mortgage Portfolio [Line Items]      
Total unpaid principal balance of mortgage loans 3,579,290   3,495,573
Amortized cost 1,181 3,112  
Unpaid principal balance 0 208  
Realized gains, net 0 2  
Mortgage loans in process of foreclosure 5,100   4,400
Single-family | allowance for the redesignated from HFI to HFS      
Loans in Mortgage Portfolio [Line Items]      
Lower of cost or fair value adjustment at time of redesignation (13) (54)  
Allowance reversed at time of redesignation 63 $ 361  
Multifamily      
Loans in Mortgage Portfolio [Line Items]      
Total unpaid principal balance of mortgage loans 410,190   403,452
Mortgage loans      
Loans in Mortgage Portfolio [Line Items]      
Accrued interest receivable $ 9,300   $ 9,100