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Mortgage Loans Credit Quality Indicators - SF (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 3,031,649 $ 3,047,794
Single-family [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,833,400 2,858,561
Single-family [Member] | Primary [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 2,645,728 2,656,220
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 2,199,656 2,156,165
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 249,031 261,709
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 120,779 140,778
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 34,295 43,014
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 18,373 23,439
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 5,811 7,529
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 17,783 23,586
Single-family [Member] | Alt-A    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 104,026 112,761
Single-family [Member] | Alt-A | 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 60,418 60,851
Single-family [Member] | Alt-A | 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 13,849 15,151
Single-family [Member] | Alt-A | 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 10,811 12,490
Single-family [Member] | Alt-A | 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 7,353 8,998
Single-family [Member] | Alt-A | 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 4,794 6,033
Single-family [Member] | Alt-A | 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 1,564 2,114
Single-family [Member] | Alt-A | Estimated mark-to-market loan-to-value ratio greater than 125% [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 5,237 7,124
Single-family [Member] | Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 40,087 44,259
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 22,119 22,558
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 5,459 6,046
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 4,424 5,236
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 3,193 3,900
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 2,039 2,615
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 671 904
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 2,182 3,000
Single-family [Member] | Government [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 43,559 $ 45,321