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Mortgage Loans Aging (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 60,485 $ 81,160
Current, recorded investment 3,194,683 3,108,815
Total recorded investment in loans 3,255,168 3,189,975
Recorded investment in loans 90 days or more delinquent and accruing interest 195 303
Recorded investment in nonaccrual loans 30,872 45,323
30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 33,720 40,034
60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 9,002 11,975
Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 17,763 29,151
Single-Family [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 60,258 80,858
Current, recorded investment 2,899,246 2,842,116
Total recorded investment in loans 2,959,504 2,922,974
Recorded investment in loans 90 days or more delinquent and accruing interest 195 303
Recorded investment in nonaccrual loans $ 30,380 $ 44,899
Single-Family [Member] | Minimum [Member]    
Table Footnote [Abstract]    
Serious delinquency: days past due 90 days 90 days
Single-Family [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 33,664 $ 40,008
Single-Family [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 9,002 11,975
Single-Family [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 17,592 28,875
Single-Family [Member] | Primary [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 53,218 69,977
Current, recorded investment 2,816,047 2,732,818
Total recorded investment in loans 2,869,265 2,802,795
Recorded investment in loans 90 days or more delinquent and accruing interest 22 87
Recorded investment in nonaccrual loans 26,170 37,971
Single-Family [Member] | Primary [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 30,471 35,582
Single-Family [Member] | Primary [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 7,881 10,396
Single-Family [Member] | Primary [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 14,866 23,999
Single-Family [Member] | Government [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 243 282
Current, recorded investment 21,887 30,807
Total recorded investment in loans 22,130 31,089
Recorded investment in loans 90 days or more delinquent and accruing interest 169 206
Recorded investment in nonaccrual loans 0 0
Single-Family [Member] | Government [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 57 55
Single-Family [Member] | Government [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 17 21
Single-Family [Member] | Government [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 169 206
Single-Family [Member] | Alt-A [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 4,997 7,751
Current, recorded investment 48,274 59,475
Total recorded investment in loans 53,271 67,226
Recorded investment in loans 90 days or more delinquent and accruing interest 2 5
Recorded investment in nonaccrual loans 3,082 5,094
Single-Family [Member] | Alt-A [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 2,332 3,186
Single-Family [Member] | Alt-A [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 821 1,147
Single-Family [Member] | Alt-A [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 1,844 3,418
Single-Family [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 1,800 2,848
Current, recorded investment 13,038 19,016
Total recorded investment in loans 14,838 21,864
Recorded investment in loans 90 days or more delinquent and accruing interest 2 5
Recorded investment in nonaccrual loans 1,128 1,834
Single-Family [Member] | Other [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 804 1,185
Single-Family [Member] | Other [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 283 411
Single-Family [Member] | Other [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 713 1,252
Multifamily [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 227 302
Current, recorded investment 295,437 266,699
Total recorded investment in loans 295,664 267,001
Recorded investment in loans 90 days or more delinquent and accruing interest 0 0
Recorded investment in nonaccrual loans $ 492 $ 424
Multifamily [Member] | Minimum [Member]    
Table Footnote [Abstract]    
Serious delinquency: days past due 60 days 60 days
Multifamily [Member] | Maximum [Member]    
Table Footnote [Abstract]    
Serious delinquency: days past due 89 days  
Multifamily [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 56 $ 26
Multifamily [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 171 $ 276