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Mortgage Loans Individually Impaired Loans - 2 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment $ 88,460 $ 110,467
Individually impaired loans with related allowance recorded: total interest income recognized 3,666 4,564
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 315 457
Individually impaired loans with no related allowance recorded: average recorded investment 19,450 18,830
Individually impaired loans with no related allowance recorded: total interest income recognized 1,250 1,259
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 169 141
Individually impaired loans: average recorded investment 107,910 129,297
Individually impaired loans: total interest income recognized 4,916 5,823
Individually impaired loans: interest income recognized on a cash basis 484 598
Single Family [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment 88,173 110,232
Individually impaired loans with related allowance recorded: total interest income recognized 3,659 4,561
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 315 457
Individually impaired loans with no related allowance recorded: average recorded investment 19,075 18,494
Individually impaired loans with no related allowance recorded: total interest income recognized 1,219 1,245
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 169 141
Single Family [Member] | Fixed Rate Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment 69,731 83,498
Individually impaired loans with related allowance recorded: total interest income recognized 2,908 3,463
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 260 372
Individually impaired loans with no related allowance recorded: average recorded investment 15,569 14,347
Individually impaired loans with no related allowance recorded: total interest income recognized 977 938
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 143 113
Single Family [Member] | FixedRateResidentialMortgage15yearMember [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment 1,176 1,410
Individually impaired loans with related allowance recorded: total interest income recognized 40 53
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 3 8
Individually impaired loans with no related allowance recorded: average recorded investment 339 192
Individually impaired loans with no related allowance recorded: total interest income recognized 15 10
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 4 4
Single Family [Member] | Adjustable Rate Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment 141 154
Individually impaired loans with related allowance recorded: total interest income recognized 6 6
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 1 1
Individually impaired loans with no related allowance recorded: average recorded investment 331 466
Individually impaired loans with no related allowance recorded: total interest income recognized 15 19
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 2 2
Single Family [Member] | Other [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment 17,125 25,170
Individually impaired loans with related allowance recorded: total interest income recognized 705 1,039
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 51 76
Individually impaired loans with no related allowance recorded: average recorded investment 2,836 3,489
Individually impaired loans with no related allowance recorded: total interest income recognized 212 278
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis 20 22
Multifamily [Member]    
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: average recorded investment 287 235
Individually impaired loans with related allowance recorded: total interest income recognized 7 3
Individually impaired loans with related allowance recorded: interest income recognized on a cash basis 0 0
Individually impaired loans with no related allowance recorded: average recorded investment 375 336
Individually impaired loans with no related allowance recorded: total interest income recognized 31 14
Individually impaired loans with no related allowance recorded: interest income recognized on a cash basis $ 0 $ 0