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Mortgage Loans Aging (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 81,160 $ 74,222
Current, recorded investment 3,108,815 3,021,594
Total recorded investment in loans 3,189,975 3,095,816
Recorded investment in loans 90 days or more delinquent and accruing interest 303 285
Recorded investment in nonaccrual loans 45,323 42,108
30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 40,034 36,709
60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 11,975 9,564
Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 29,151 27,949
Single-Family [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 80,858 74,049
Current, recorded investment 2,842,116 2,789,886
Total recorded investment in loans 2,922,974 2,863,935
Recorded investment in loans 90 days or more delinquent and accruing interest 303 285
Recorded investment in nonaccrual loans $ 44,899 $ 41,705
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 $ 40,008 $ 36,665
Single-Family [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 11,975 9,564
Single-Family [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 28,875 27,820
Single-Family [Member] | Primary [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 69,977 61,302
Current, recorded investment 2,732,818 2,654,195
Total recorded investment in loans 2,802,795 2,715,497
Recorded investment in loans 90 days or more delinquent and accruing interest 87 22
Recorded investment in nonaccrual loans 37,971 33,448
Single-Family [Member] | Primary [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 35,582 31,631
Single-Family [Member] | Primary [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 10,396 7,910
Single-Family [Member] | Primary [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 23,999 21,761
Single-Family [Member] | Government [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 282 334
Current, recorded investment 30,807 36,814
Total recorded investment in loans 31,089 37,148
Recorded investment in loans 90 days or more delinquent and accruing interest 206 256
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 55 56
Single-Family [Member] | Government [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 21 22
Single-Family [Member] | Government [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 206 256
Single-Family [Member] | Alt-A [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 7,751 9,044
Current, recorded investment 59,475 72,903
Total recorded investment in loans 67,226 81,947
Recorded investment in loans 90 days or more delinquent and accruing interest 5 2
Recorded investment in nonaccrual loans 5,094 6,019
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 3,186 3,629
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 1,147 1,194
Single-Family [Member] | Alt-A [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 3,418 4,221
Single-Family [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 2,848 3,369
Current, recorded investment 19,016 25,974
Total recorded investment in loans 21,864 29,343
Recorded investment in loans 90 days or more delinquent and accruing interest 5 5
Recorded investment in nonaccrual loans 1,834 2,238
Single-Family [Member] | Other [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 1,185 1,349
Single-Family [Member] | Other [Member] | 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 411 438
Single-Family [Member] | Other [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 1,252 1,582
Multifamily [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment 302 173
Current, recorded investment 266,699 231,708
Total recorded investment in loans 267,001 231,881
Recorded investment in loans 90 days or more delinquent and accruing interest 0 0
Recorded investment in nonaccrual loans $ 424 $ 403
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 89 days
Multifamily [Member] | 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 26 $ 44
Multifamily [Member] | Seriously Delinquent [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Days delinquent, recorded investment $ 276 $ 129