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Mortgage Loans Credit Quality Indicators - SF (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 3,122,450 $ 3,095,816
Single-family [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,879,846 2,863,935
Single-family [Member] | Primary [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,737,968 2,715,497
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio less than or equal to 80% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,334,050 2,321,201
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 80% and less than or equal to 90% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 249,910 244,231
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 90% and less than or equal to 100% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 120,954 114,412
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 100% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 33,054 35,653
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 78,304 81,947
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio less than or equal to 80% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 54,618 56,250
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 80% and less than or equal to 90% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 9,225 9,787
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 90% and less than or equal to 100% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 6,175 6,731
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 100% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 8,286 9,179
Single-family [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 27,343 29,343
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio less than or equal to 80% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 18,508 19,382
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 80% and less than or equal to 90% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 3,297 3,657
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 90% and less than or equal to 100% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,336 2,627
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 100% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 3,202 3,677
Single-family [Member] | Government [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 36,231 $ 37,148