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Fair Value Level 3 Valuation Inputs (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives $ 807 [1] $ 334 [1]
Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (1,775) (1,308)
Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 14,637 14,268
Long-term Debt, Fair Value (15,373) (14,976)
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 1,345 195
Trading securities 2,811 2,774
Available-for-sale securities 18,463 19,012
Mortgage loans held for investment, at fair value 394,999 392,355
Total assets at fair value 418,944 415,630
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 213,181 215,960
Long-term Debt, Fair Value (906) (1,557)
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 181,818 176,395
Long-term Debt, Fair Value (13,518) (13,362)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 232 132
Other assets 65 121
Total assets at fair value 24,755 25,970
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 1 26
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Build-Up [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 114 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 56 81
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 4 5
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Consensus without Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 118 132
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Walk Forwards [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 4 9
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 4,537 4,041
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,251 1,077
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 957 1,049
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 185 118
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member] | Accepted Offers [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 993 691
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member] | Walk Forwards [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,151 1,106
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 1,714 [2] 1,533
Acquired property, net 112 98
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 36 39
Acquired property, net 52 65
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member] | Build-Up [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 522 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 11 16
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member] | Broker Price Opinions [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 196 248
Acquired property, net 45 9
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member] | Accepted Offers [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 15 24
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Multifamily [Member] | Asset Manager Estimate [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 949 1,230
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fannie Mae [Member] | Single-Family [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 18,039 [3] 19,966 [3]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fannie Mae [Member] | Single-Family [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 18,039 19,966
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Consolidated Trusts [Member] | Single-Family [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 56 [3] 79 [3]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 56 79
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 2,811 2,774
Available-for-sale securities 18,463 19,012
Derivatives (23) (40)
Long-term Debt, Fair Value (816) (1,473)
Total assets at fair value 23,980 24,555
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1,453 1,448
Available-for-sale securities 7,030 7,068
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Mortgage revenue bonds [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 601 565
Available-for-sale securities 5,006 5,253
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 102 99
Available-for-sale securities 2,844 2,885
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 655 618
Available-for-sale securities 3,570 3,791
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   50
Available-for-sale securities 1,068 816
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   6.90% [4],[5]
Prepayment Speed (%)   0.10% [5]
Severity (%)   75.00% [5]
Spreads (bps)   3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   6.90% [4],[5]
Prepayment Speed (%)   0.10% [5]
Severity (%)   75.00% [5]
Spreads (bps)   3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   6.90% [4],[5]
Prepayment Speed (%)   0.10% [5]
Severity (%)   75.00% [5]
Spreads (bps)   3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.90% [4],[5] 0.70% [4],[5]
Prepayment Speed (%) 0.40% [5] 0.20% [5]
Severity (%) 7.70% [5] 43.80% [5]
Spreads (bps) 1.60% [5] 1.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 9.30% [4],[5] 7.60% [4],[5]
Prepayment Speed (%) 13.20% [5] 12.50% [5]
Severity (%) 100.00% [5] 98.00% [5]
Spreads (bps) 3.90% [5] 3.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 4.90% [4],[5] 5.10% [4],[5]
Prepayment Speed (%) 3.00% [5] 4.10% [5]
Severity (%) 83.70% [5] 79.50% [5]
Spreads (bps) 2.782% [5] 2.924% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 582 539
Available-for-sale securities 1,767 1,899
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 1.031% [5] 0.35% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 4.40% [5] 4.40% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 3.421% [5] 3.406% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 0.00% [5] 0.055% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 6.449% [5] 4.90% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage revenue bonds [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 3.302% [5] 3.10% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 102 99
Available-for-sale securities 915 610
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 4.90% [5] 5.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 4.90% [5] 5.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 4.90% [5] 5.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 1.40% [5] 5.00% [5]
Prepayment Speed (%) 3.00% [5] 10.00% [5]
Severity (%) 4.50% [5] 55.00% [5]
Spreads (bps) 1.821% [5] 3.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 5.00% [5] 5.00% [5]
Prepayment Speed (%) 8.00% [5] 10.00% [5]
Severity (%) 85.00% [5] 55.00% [5]
Spreads (bps) 4.76% [5] 5.11% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Other [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 4.20% [5] 5.00% [5]
Prepayment Speed (%) 4.00% [5] 10.00% [5]
Severity (%) 67.50% [5] 55.00% [5]
Spreads (bps) 3.672% [5] 4.695% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 290 148
Available-for-sale securities 621 420
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.70% [4],[5] 4.00% [4],[5]
Prepayment Speed (%) 2.00% [5] 1.90% [5]
Severity (%) 62.30% [5] 42.70% [5]
Spreads (bps) 3.055% [5] 3.254% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 9.50% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 4.60% [5] 3.40% [5]
Severity (%) 81.50% [5] 77.30% [5]
Spreads (bps) 3.86% [5] 4.394% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 8.40% [4],[5] 6.50% [4],[5]
Prepayment Speed (%) 2.70% [5] 2.20% [5]
Severity (%) 76.60% [5] 67.60% [5]
Spreads (bps) 3.719% [5] 4.186% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 1.60% [4],[5] 2.30% [4],[5]
Prepayment Speed (%) 0.00% [5] 1.20% [5]
Severity (%) 0.20% [5] 45.20% [5]
Spreads (bps) 1.95% [5] 2.202% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 17.20% [4],[5] 10.10% [4],[5]
Prepayment Speed (%) 17.40% [5] 7.00% [5]
Severity (%) 78.30% [5] 79.50% [5]
Spreads (bps) 3.996% [5] 5.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 6.30% [4],[5] 5.10% [4],[5]
Prepayment Speed (%) 5.00% [5] 3.40% [5]
Severity (%) 57.20% [5] 60.50% [5]
Spreads (bps) 3.153% [5] 3.813% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives (84) (64)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Dealer Mark [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives 66 32
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives (5) (8)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member] | Agency [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   44 [6]
Available-for-sale securities 13 [6] 15 [6]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 264  
Available-for-sale securities 340 65
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member] | Mortgage revenue bonds [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 19 26
Available-for-sale securities 10 31
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 1,161 1,045
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 43  
Available-for-sale securities 560 109
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 451 400
Available-for-sale securities 2,826 2,981
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 1.70% [4],[5] 3.00% [4],[5]
Prepayment Speed (%) 0.20% [5] 1.40% [5]
Severity (%) 33.30% [5] 50.40% [5]
Spreads (bps) 2.90% [5] 3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 10.90% [4],[5] 9.20% [4],[5]
Prepayment Speed (%) 4.10% [5] 2.20% [5]
Severity (%) 95.00% [5] 87.20% [5]
Spreads (bps) 3.90% [5] 4.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 4.40% [4],[5] 6.40% [4],[5]
Prepayment Speed (%) 1.90% [5] 1.90% [5]
Severity (%) 64.90% [5] 74.40% [5]
Spreads (bps) 3.836% [5] 3.53% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.00% [4],[5] 0.00% [4],[5]
Prepayment Speed (%) 0.10% [5] 0.30% [5]
Severity (%) 0.50% [5] 36.80% [5]
Spreads (bps) 1.60% [5] 1.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 25.00% [4],[5] 36.80% [4],[5]
Prepayment Speed (%) 7.90% [5] 9.70% [5]
Severity (%) 99.10% [5] 100.00% [5]
Spreads (bps) 4.40% [5] 3.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 6.00% [4],[5] 7.40% [4],[5]
Prepayment Speed (%) 2.10% [5] 2.30% [5]
Severity (%) 80.50% [5] 81.70% [5]
Spreads (bps) 2.93% [5] 3.199% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 371 483
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Other [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.70% [5] 0.10% [5]
Prepayment Speed (%) 3.00% [5] 3.00% [5]
Severity (%) 60.80% [5] 65.00% [5]
Spreads (bps) 2.364% [5] 2.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Other [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 9.80% [5] 5.00% [5]
Prepayment Speed (%) 7.60% [5] 11.40% [5]
Severity (%) 100.00% [5] 85.00% [5]
Spreads (bps) 4.848% [5] 9.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Other [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 4.70% [5] 5.00% [5]
Prepayment Speed (%) 3.20% [5] 3.00% [5]
Severity (%) 85.90% [5] 84.60% [5]
Spreads (bps) 3.317% [5] 5.264% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 322 325
Available-for-sale securities 1,740 1,948
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.70% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 1.50% [5] 1.90% [5]
Severity (%) 55.80% [5] 77.30% [5]
Spreads (bps) 2.78% [5] 2.983% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 8.20% [4],[5] 10.40% [4],[5]
Prepayment Speed (%) 4.60% [5] 2.50% [5]
Severity (%) 77.10% [5] 97.80% [5]
Spreads (bps) 4.62% [5] 4.202% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 6.30% [4],[5] 8.90% [4],[5]
Prepayment Speed (%) 2.30% [5] 2.20% [5]
Severity (%) 72.90% [5] 88.70% [5]
Spreads (bps) 3.356% [5] 3.663% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.20% [4],[5] 0.10% [4],[5]
Prepayment Speed (%) 0.40% [5] 0.10% [5]
Severity (%) 0.80% [5] 7.20% [5]
Spreads (bps) 1.92% [5] 2.106% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 9.90% [4],[5] 10.30% [4],[5]
Prepayment Speed (%) 39.00% [5] 32.90% [5]
Severity (%) 81.30% [5] 100.00% [5]
Spreads (bps) 3.65% [5] 4.042% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 3.80% [4],[5] 3.50% [4],[5]
Prepayment Speed (%) 7.20% [5] 9.90% [5]
Severity (%) 55.80% [5] 62.30% [5]
Spreads (bps) 2.966% [5] 3.367% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   113
Available-for-sale securities   442
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   3.10% [4],[5]
Prepayment Speed (%)   1.80% [5]
Severity (%)   75.00% [5]
Spreads (bps)   3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   7.50% [4],[5]
Prepayment Speed (%)   2.50% [5]
Severity (%)   87.20% [5]
Spreads (bps)   3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   3.90% [4],[5]
Prepayment Speed (%)   2.00% [5]
Severity (%)   75.80% [5]
Spreads (bps)   3.25% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   1.80% [4],[5]
Prepayment Speed (%)   1.00% [5]
Severity (%)   65.00% [5]
Spreads (bps)   2.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   11.00% [4],[5]
Prepayment Speed (%)   9.40% [5]
Severity (%)   100.00% [5]
Spreads (bps)   3.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Subprime private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   7.40% [4],[5]
Prepayment Speed (%)   2.00% [5]
Severity (%)   82.20% [5]
Spreads (bps)   3.152% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Mortgage revenue bonds [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 2,165 1,937
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Mortgage revenue bonds [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 0.00% [5] 0.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Mortgage revenue bonds [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 3.939% [5] 4.632% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Mortgage revenue bonds [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 0.758% [5] 1.121% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   60
Available-for-sale securities   139
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   6.00% [4],[5]
Prepayment Speed (%)   4.10% [5]
Severity (%)   76.10% [5]
Spreads (bps)   4.14%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   10.80% [4],[5]
Prepayment Speed (%)   5.40% [5]
Severity (%)   92.70% [5]
Spreads (bps)   4.22%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   8.70% [4],[5]
Prepayment Speed (%)   4.60% [5]
Severity (%)   83.10% [5]
Spreads (bps)   4.18%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   0.90% [4],[5]
Prepayment Speed (%)   9.30% [5]
Severity (%)   53.70% [5]
Spreads (bps)   3.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   6.40% [4],[5]
Prepayment Speed (%)   11.90% [5]
Severity (%)   82.60% [5]
Spreads (bps)   4.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Alt-A private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   3.90% [4],[5]
Prepayment Speed (%)   11.30% [5]
Severity (%)   68.80% [5]
Spreads (bps)   3.493% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus without Inputs [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 738 808
Available-for-sale securities 2,796 2,442
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus without Inputs [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 397 625
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus without Inputs [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   85
Available-for-sale securities 649 740
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor Without Inputs [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   77
Available-for-sale securities   322
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor Without Inputs [Member] | Mortgage revenue bonds [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 1,064 1,386
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor Without Inputs [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities   122
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor Without Inputs [Member] | Alt-A private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities   435
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (310) (955)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Senior Floating [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (310) (955)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Consensus with Inputs [Member] | Senior Floating [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value   (689)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Consensus with Inputs [Member] | Long-term debt [Member] | Senior Floating [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   0.20% [5]
Prepayment Speed (%)   8.40% [5]
Spreads (bps)   1.71% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Consensus with Inputs [Member] | Long-term debt [Member] | Senior Floating [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   0.20% [5]
Prepayment Speed (%)   8.40% [5]
Spreads (bps)   4.38% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Consensus with Inputs [Member] | Long-term debt [Member] | Senior Floating [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   0.20% [5]
Prepayment Speed (%)   8.40% [5]
Spreads (bps)   3.062% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Discounted Cash Flow without Inputs [Member] | Senior Floating [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (310) (266)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 2,608 2,704
Long-term Debt, Fair Value (506) (518)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Discounted Cash Flow with Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (352)  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Discounted Cash Flow with Inputs [Member] | Long-term debt [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 1.20% [5]  
Prepayment Speed (%) 0.50% [5]  
Severity (%) 43.50% [5]  
Spreads (bps) 1.201% [5]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Discounted Cash Flow with Inputs [Member] | Long-term debt [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 5.50% [5]  
Prepayment Speed (%) 100.00% [5]  
Severity (%) 100.00% [5]  
Spreads (bps) 9.15% [5]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Discounted Cash Flow with Inputs [Member] | Long-term debt [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 2.90% [5]  
Prepayment Speed (%) 10.30% [5]  
Severity (%) 87.30% [5]  
Spreads (bps) 4.166% [5]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (154) (95)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Consensus with Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value   (116)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Consensus with Inputs [Member] | Long-term debt [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   1.10% [5]
Prepayment Speed (%)   0.20% [5]
Severity (%)   63.90% [5]
Spreads (bps)   1.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Consensus with Inputs [Member] | Long-term debt [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   4.70% [5]
Prepayment Speed (%)   16.70% [5]
Severity (%)   89.50% [5]
Spreads (bps)   9.50% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Consensus with Inputs [Member] | Long-term debt [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   3.20% [5]
Prepayment Speed (%)   15.20% [5]
Severity (%)   85.60% [5]
Spreads (bps)   2.951% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Consensus without Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value   (227)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single Vendor Without Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value   (80)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 2,430 2,529
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Build-Up [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 1,751 1,828
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Build-Up [Member] | Mortgage Loans [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 0.10% [5] 0.10% [5]
Prepayment Speed (%) 2.50% [5] 2.30% [5]
Severity (%) 5.10% [5] 0.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Build-Up [Member] | Mortgage Loans [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 98.60% [5] 95.60% [5]
Prepayment Speed (%) 50.40% [5] 37.60% [5]
Severity (%) 100.00% [5] 100.00% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Build-Up [Member] | Mortgage Loans [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 15.60% [5] 15.70% [5]
Prepayment Speed (%) 15.50% [5] 14.10% [5]
Severity (%) 28.00% [5] 26.60% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Discounted Cash Flow with Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 613 310
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage Loans [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 1.20% [5] 1.20% [5]
Prepayment Speed (%) 0.50% [5] 1.90% [5]
Severity (%) 43.50% [5] 58.80% [5]
Spreads (bps) 1.60% [5] 1.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage Loans [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 12.30% [5] 15.70% [5]
Prepayment Speed (%) 14.20% [5] 16.70% [5]
Severity (%) 100.00% [5] 97.70% [5]
Spreads (bps) 9.15% [5] 3.606% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Discounted Cash Flow with Inputs [Member] | Mortgage Loans [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%) 3.80% [5] 7.00% [5]
Prepayment Speed (%) 5.40% [5] 7.00% [5]
Severity (%) 83.50% [5] 75.50% [5]
Spreads (bps) 3.266% [5] 2.521% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 66 60
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Consensus with Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value   112
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Consensus with Inputs [Member] | Mortgage Loans [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   1.10% [5]
Prepayment Speed (%)   0.20% [5]
Severity (%)   63.90% [5]
Spreads (bps)   1.75% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Consensus with Inputs [Member] | Mortgage Loans [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   4.70% [5]
Prepayment Speed (%)   16.70% [5]
Severity (%)   89.50% [5]
Spreads (bps)   9.50% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Consensus with Inputs [Member] | Mortgage Loans [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   3.20% [5]
Prepayment Speed (%)   15.20% [5]
Severity (%)   85.60% [5]
Spreads (bps)   2.939% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Single-Family [Member] | Consensus without Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value   219
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Multifamily [Member] | Build-Up [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 178 $ 175
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Multifamily [Member] | Build-Up [Member] | Mortgage Loans [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 0.53% [5] 0.62% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Multifamily [Member] | Build-Up [Member] | Mortgage Loans [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 2.664% [5] 2.434% [5]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member] | Multifamily [Member] | Build-Up [Member] | Mortgage Loans [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Spreads (bps) 1.154% [5] 1.143% [5]
[1] Excludes derivative assets of $29 million and $1.7 billion and derivative liabilities of $1 million and $1.1 billion recognized in our condensed consolidated balance sheets as of March 31, 2014 and December 31, 2013, respectively, that are not subject to enforceable master netting arrangements.
[2] Includes $522 million of mortgage loans held for investment that were redesignated to mortgage loans held for sale as of March 31, 2014.
[3] Excludes estimated recoveries from mortgage insurance proceeds.
[4] Default Rate as disclosed represents the estimated beginning annualized rate of default and is used as a basis to forecast the future default rates that serve as an input for valuation.
[5] Valuation techniques for which no unobservable inputs are disclosed generally reflect the use of third-party pricing services or dealers, and the range of unobservable inputs applied by these sources is not readily available or cannot be reasonably estimated. Where we have disclosed unobservable inputs for consensus and single vendor techniques, those inputs are based on our validations performed at the security level using discounted cash flows.
[6] Includes Fannie Mae, Freddie Mac and Ginnie Mae securities.