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Mortgage Loans Credit Quality Indicators - SF (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 3,040,217 $ 3,035,712
Single-family [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,832,261 2,835,538
Single-family [Member] | Primary [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,664,635 2,662,193
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 2,216,911 2,228,533
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 255,504 250,373
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 133,225 122,939
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 100% and less than or equal to 110% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 27,604 27,875
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 110% and less than or equal to 120% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 14,175 14,625
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 120% and less than or equal to 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 4,361 4,520
Single-family [Member] | Primary [Member] | Estimated mark-to-market loan-to-value ratio greater than 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 12,855 13,328
Single-family [Member] | Alt-A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 92,726 96,101
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 57,304 59,000
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 11,966 12,588
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 8,965 9,345
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 100% and less than or equal to 110% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 5,984 6,231
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 110% and less than or equal to 120% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 3,633 3,730
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 120% and less than or equal to 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 1,163 1,260
Single-family [Member] | Alt-A [Member] | Estimated mark-to-market loan-to-value ratio greater than 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 3,711 3,947
Single-family [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 34,825 36,410
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 20,615 21,274
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 4,619 4,936
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 3,602 3,861
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 100% and less than or equal to 110% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,478 2,596
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 110% and less than or equal to 120% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 1,512 1,592
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 120% and less than or equal to 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 484 545
Single-family [Member] | Other [Member] | Estimated mark-to-market loan-to-value ratio greater than 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 1,515 1,606
Single-family [Member] | Government [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 40,075 $ 40,834