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Fair Value Level 3 Valuation Inputs (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives $ 1,230 [1] $ 334 [1]
Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (5,204) (1,308)
Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 15,262 14,268
Long-term Debt, Fair Value (16,598) (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 210 195
Trading securities 3,128 2,774
Available-for-sale securities 15,897 19,012
Mortgage loans held for investment, at fair value 389,199 392,355
Total assets at fair value 409,718 415,630
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 218,495 215,960
Long-term Debt, Fair Value (942) (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 170,704 176,395
Long-term Debt, Fair Value (16,457) (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 151 132
Other assets 39 121
Total assets at fair value 22,465 25,970
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 2 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 38 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 32 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 5 14
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 113 132
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Single-Family [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 4,544 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 1,611 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 909 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 125 118
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 845 691
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 1,054 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 747 1,533
Acquired property, net 157 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 16 39
Acquired property, net 66 65
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 0 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 100 248
Acquired property, net 86 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 5 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 631 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 16,771 [2] 19,966 [2]
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 16,771 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 [2] 79 [2]
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 3,128 2,774
Available-for-sale securities 15,897 19,012
Derivatives (9) (40)
Long-term Debt, Fair Value (824) (1,473)
Total assets at fair value 21,021 24,555
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Agency [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 325 [3]  
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 695 618
Available-for-sale securities 3,496 3,791
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 1,316 1,448
Available-for-sale securities 5,386 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 693 565
Available-for-sale securities 4,266 5,253
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 99 99
Available-for-sale securities 2,743 2,885
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Agency [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 34 [3]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Agency [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 1.288% [3],[4]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Agency [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 1.288% [3],[4]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted Cash Flow with Inputs [Member] | Agency [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 1.288% [3],[4]  
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 110 148
Available-for-sale securities 467 420
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 (%) 8.00% [4],[5] 4.00% [4],[5]
Prepayment Speed (%) 2.00% [4] 1.90% [4]
Severity (%) 69.40% [4] 42.70% [4]
Spreads (bps) 2.887% [4] 3.254% [4]
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 (%) 8.00% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 2.00% [4] 3.40% [4]
Severity (%) 69.40% [4] 77.30% [4]
Spreads (bps) 2.887% [4] 4.394% [4]
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 (%) 8.00% [4],[5] 6.50% [4],[5]
Prepayment Speed (%) 2.00% [4] 2.20% [4]
Severity (%) 69.40% [4] 67.60% [4]
Spreads (bps) 2.887% [4] 4.186% [4]
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 (%) 1.50% [4],[5] 2.30% [4],[5]
Prepayment Speed (%) 1.50% [4] 1.20% [4]
Severity (%) 26.50% [4] 45.20% [4]
Spreads (bps) 2.00% [4] 2.202% [4]
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 (%) 13.50% [4],[5] 10.10% [4],[5]
Prepayment Speed (%) 8.40% [4] 7.00% [4]
Severity (%) 92.80% [4] 79.50% [4]
Spreads (bps) 3.20% [4] 5.00% [4]
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 (%) 3.40% [4],[5] 5.10% [4],[5]
Prepayment Speed (%) 7.10% [4] 3.40% [4]
Severity (%) 48.00% [4] 60.50% [4]
Spreads (bps) 2.533% [4] 3.813% [4]
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 147 50
Available-for-sale securities 253 816
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 (%) 1.50% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 2.20% [4] 0.10% [4]
Severity (%) 62.00% [4] 75.00% [4]
Spreads (bps) 2.45% [4] 3.25% [4]
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 (%) 1.50% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 2.20% [4] 0.10% [4]
Severity (%) 62.00% [4] 75.00% [4]
Spreads (bps) 2.45% [4] 3.25% [4]
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 (%) 1.50% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 2.20% [4] 0.10% [4]
Severity (%) 62.00% [4] 75.00% [4]
Spreads (bps) 2.45% [4] 3.25% [4]
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 (%) 2.50% [4],[5] 0.70% [4],[5]
Prepayment Speed (%) 1.40% [4] 0.20% [4]
Severity (%) 64.90% [4] 43.80% [4]
Spreads (bps) 1.35% [4] 1.75% [4]
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 (%) 7.50% [4],[5] 7.60% [4],[5]
Prepayment Speed (%) 8.40% [4] 12.50% [4]
Severity (%) 95.00% [4] 98.00% [4]
Spreads (bps) 2.50% [4] 3.75% [4]
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 (%) 6.40% [4],[5] 5.10% [4],[5]
Prepayment Speed (%) 2.30% [4] 4.10% [4]
Severity (%) 70.40% [4] 79.50% [4]
Spreads (bps) 2.178% [4] 2.924% [4]
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 672 539
Available-for-sale securities 1,963 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) 0.209% [4] 0.35% [4]
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) 3.00% [4] 4.40% [4]
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) 2.546% [4] 3.406% [4]
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) 0.035% [4] 0.055% [4]
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) 6.046% [4] 4.90% [4]
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) 2.446% [4] 3.10% [4]
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 99 99
Available-for-sale securities 632 610
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) 4.45% [4] 5.25% [4]
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) 4.45% [4] 5.25% [4]
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) 4.45% [4] 5.25% [4]
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 (%) 3.00% [4] 5.00% [4]
Prepayment Speed (%) 2.10% [4] 10.00% [4]
Severity (%) 33.90% [4] 55.00% [4]
Spreads (bps) 2.20% [4] 3.00% [4]
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% [4] 5.00% [4]
Prepayment Speed (%) 3.00% [4] 10.00% [4]
Severity (%) 85.00% [4] 55.00% [4]
Spreads (bps) 4.31% [4] 5.11% [4]
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 (%) 4.90% [4] 5.00% [4]
Prepayment Speed (%) 2.90% [4] 10.00% [4]
Severity (%) 81.50% [4] 55.00% [4]
Spreads (bps) 3.833% [4] 4.695% [4]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives (96) (64)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Dealer Mark [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives 95 32
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Derivatives (8) (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 1 [3] 44 [3]
Available-for-sale securities 6 [3] 15 [3]
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 35  
Available-for-sale securities 519 109
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 401  
Available-for-sale securities 514 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 21 26
Available-for-sale securities 18 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 887 1,045
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Agency [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 136 [3]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Agency [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 0.041% [3],[4]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Agency [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 1.991% [3],[4]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with Inputs [Member] | Agency [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 0.318% [3],[4]  
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 127 325
Available-for-sale securities 1,242 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 (%) 4.20% [4],[5] 6.90% [4],[5]
Prepayment Speed (%) 2.20% [4] 1.90% [4]
Severity (%) 39.20% [4] 77.30% [4]
Spreads (bps) 2.20% [4] 2.983% [4]
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 (%) 13.40% [4],[5] 10.40% [4],[5]
Prepayment Speed (%) 21.40% [4] 2.50% [4]
Severity (%) 57.20% [4] 97.80% [4]
Spreads (bps) 2.46% [4] 4.202% [4]
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 (%) 5.30% [4],[5] 8.90% [4],[5]
Prepayment Speed (%) 4.50% [4] 2.20% [4]
Severity (%) 41.40% [4] 88.70% [4]
Spreads (bps) 2.402% [4] 3.663% [4]
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 (%) 0.10% [4],[5] 0.10% [4],[5]
Prepayment Speed (%) 0.20% [4] 0.10% [4]
Severity (%) 13.50% [4] 7.20% [4]
Spreads (bps) 1.292% [4] 2.106% [4]
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 (%) 28.50% [4],[5] 10.30% [4],[5]
Prepayment Speed (%) 37.90% [4] 32.90% [4]
Severity (%) 95.00% [4] 100.00% [4]
Spreads (bps) 3.50% [4] 4.042% [4]
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 (%) 5.70% [4],[5] 3.50% [4],[5]
Prepayment Speed (%) 11.30% [4] 9.90% [4]
Severity (%) 67.10% [4] 62.30% [4]
Spreads (bps) 2.157% [4] 3.367% [4]
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 539 400
Available-for-sale securities 3,187 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 (%) 1.20% [4] 1.40% [4]
Severity (%) 34.60% [4] 50.40% [4]
Spreads (bps) 2.45% [4] 3.25% [4]
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 (%) 9.10% [4],[5] 9.20% [4],[5]
Prepayment Speed (%) 5.50% [4] 2.20% [4]
Severity (%) 94.30% [4] 87.20% [4]
Spreads (bps) 2.45% [4] 4.25% [4]
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 (%) 5.40% [4],[5] 6.40% [4],[5]
Prepayment Speed (%) 2.40% [4] 1.90% [4]
Severity (%) 79.00% [4] 74.40% [4]
Spreads (bps) 2.45% [4] 3.53% [4]
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 (%) 1.90% [4],[5] 0.00% [4],[5]
Prepayment Speed (%) 0.20% [4] 0.30% [4]
Severity (%) 39.70% [4] 36.80% [4]
Spreads (bps) 1.35% [4] 1.75% [4]
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 (%) 33.20% [4],[5] 36.80% [4],[5]
Prepayment Speed (%) 14.40% [4] 9.70% [4]
Severity (%) 95.00% [4] 100.00% [4]
Spreads (bps) 2.45% [4] 3.75% [4]
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 (%) 6.40% [4],[5] 7.40% [4],[5]
Prepayment Speed (%) 2.80% [4] 2.30% [4]
Severity (%) 82.80% [4] 81.70% [4]
Spreads (bps) 1.977% [4] 3.199% [4]
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 666 483
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 (%) 0.00% [4] 0.10% [4]
Prepayment Speed (%) 3.00% [4] 3.00% [4]
Severity (%) 0.50% [4] 65.00% [4]
Spreads (bps) 1.95% [4] 2.75% [4]
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 (%) 8.50% [4] 5.00% [4]
Prepayment Speed (%) 10.50% [4] 11.40% [4]
Severity (%) 85.00% [4] 85.00% [4]
Spreads (bps) 4.843% [4] 9.25% [4]
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 (%) 4.30% [4] 5.00% [4]
Prepayment Speed (%) 4.00% [4] 3.00% [4]
Severity (%) 60.10% [4] 84.60% [4]
Spreads (bps) 3.102% [4] 5.264% [4]
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Agency [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 98 [3]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Agency [Member] | Trading securities [Member] | Minimum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 0.473% [3],[4]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Agency [Member] | Trading securities [Member] | Maximum [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 1.532% [3],[4]  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor With Inputs [Member] | Agency [Member] | Trading securities [Member] | Weighted Average [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 100.00% [3],[4]  
Spreads (bps) 1.149% [3],[4]  
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 70 60
Available-for-sale securities 353 139
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 (%) 7.20% [4],[5] 6.00% [4],[5]
Prepayment Speed (%) 1.60% [4] 4.10% [4]
Severity (%) 31.00% [4] 76.10% [4]
Spreads (bps) 2.427% [4] 4.143% [4]
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 (%) 15.90% [4],[5] 10.80% [4],[5]
Prepayment Speed (%) 4.20% [4] 5.40% [4]
Severity (%) 78.80% [4] 92.70% [4]
Spreads (bps) 2.533% [4] 4.217% [4]
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 (%) 9.50% [4],[5] 8.70% [4],[5]
Prepayment Speed (%) 3.50% [4] 4.60% [4]
Severity (%) 43.40% [4] 83.10% [4]
Spreads (bps) 2.506% [4] 4.175% [4]
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 (%) 1.90% [4],[5] 0.90% [4],[5]
Prepayment Speed (%) 4.10% [4] 9.30% [4]
Severity (%) 20.40% [4] 53.70% [4]
Spreads (bps) 1.542% [4] 3.00% [4]
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 (%) 24.10% [4],[5] 6.40% [4],[5]
Prepayment Speed (%) 11.60% [4] 11.90% [4]
Severity (%) 95.00% [4] 82.60% [4]
Spreads (bps) 2.95% [4] 4.00% [4]
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 (%) 5.10% [4],[5] 3.90% [4],[5]
Prepayment Speed (%) 7.80% [4] 11.30% [4]
Severity (%) 54.40% [4] 68.80% [4]
Spreads (bps) 2.238% [4] 3.493% [4]
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% [4]
Severity (%)   75.00% [4]
Spreads (bps)   3.25% [4]
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% [4]
Severity (%)   87.20% [4]
Spreads (bps)   3.25% [4]
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% [4]
Severity (%)   75.80% [4]
Spreads (bps)   3.25% [4]
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% [4]
Severity (%)   65.00% [4]
Spreads (bps)   2.75% [4]
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% [4]
Severity (%)   100.00% [4]
Spreads (bps)   3.75% [4]
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% [4]
Severity (%)   82.20% [4]
Spreads (bps)   3.152% [4]
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 1,728 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) 0.035% [4] 0.00% [4]
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) 3.786% [4] 4.632% [4]
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) 0.61% [4] 1.121% [4]
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 353 85
Available-for-sale securities 915 740
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 229 808
Available-for-sale securities 1,095 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 558 625
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single Vendor Without Inputs [Member] | Agency [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 56 [3]  
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] | Single Vendor Without Inputs [Member] | Subprime private-label securities [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   77
Available-for-sale securities 337 322
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 557 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] | Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term Debt, Fair Value (336) (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 (336) (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% [4]
Prepayment Speed (%)   8.40% [4]
Spreads (bps)   1.71% [4]
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% [4]
Prepayment Speed (%)   8.40% [4]
Spreads (bps)   4.38% [4]
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% [4]
Prepayment Speed (%)   8.40% [4]
Spreads (bps)   3.062% [4]
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 (336) (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 1,871 2,704
Long-term Debt, Fair Value (488) (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 (142)  
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 (%) 1.30% [4]  
Prepayment Speed (%) 0.80% [4]  
Severity (%) 44.40% [4]  
Spreads (bps) 1.003% [4]  
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 (%) 12.80% [4]  
Prepayment Speed (%) 100.00% [4]  
Severity (%) 95.00% [4]  
Spreads (bps) 5.00% [4]  
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 (%) 3.70% [4]  
Prepayment Speed (%) 15.50% [4]  
Severity (%) 66.00% [4]  
Spreads (bps) 2.391% [4]  
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 (54) (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% [4]
Prepayment Speed (%)   0.20% [4]
Severity (%)   63.90% [4]
Spreads (bps)   1.75% [4]
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% [4]
Prepayment Speed (%)   16.70% [4]
Severity (%)   89.50% [4]
Spreads (bps)   9.50% [4]
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% [4]
Prepayment Speed (%)   15.20% [4]
Severity (%)   85.60% [4]
Spreads (bps)   2.951% [4]
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 (208) (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 (84) (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 1,693 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 972 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 (%) 0.00% [4] 0.10% [4]
Prepayment Speed (%) 3.50% [4] 2.30% [4]
Severity (%) 3.70% [4] 0.00% [4]
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 (%) 98.00% [4] 95.60% [4]
Prepayment Speed (%) 99.30% [4] 37.60% [4]
Severity (%) 95.00% [4] 100.00% [4]
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 (%) 15.20% [4] 15.70% [4]
Prepayment Speed (%) 14.80% [4] 14.10% [4]
Severity (%) 23.30% [4] 26.60% [4]
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 409 310
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% [4] 1.20% [4]
Prepayment Speed (%) 0.80% [4] 1.90% [4]
Severity (%) 44.40% [4] 58.80% [4]
Spreads (bps) 1.35% [4] 1.75% [4]
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 (%) 14.60% [4] 15.70% [4]
Prepayment Speed (%) 29.70% [4] 16.70% [4]
Severity (%) 95.00% [4] 97.70% [4]
Spreads (bps) 5.00% [4] 3.606% [4]
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 (%) 5.80% [4] 7.00% [4]
Prepayment Speed (%) 9.70% [4] 7.00% [4]
Severity (%) 69.90% [4] 75.50% [4]
Spreads (bps) 2.252% [4] 2.521% [4]
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 52 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% [4]
Prepayment Speed (%)   0.20% [4]
Severity (%)   63.90% [4]
Spreads (bps)   1.75% [4]
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% [4]
Prepayment Speed (%)   16.70% [4]
Severity (%)   89.50% [4]
Spreads (bps)   9.50% [4]
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% [4]
Prepayment Speed (%)   15.20% [4]
Severity (%)   85.60% [4]
Spreads (bps)   2.939% [4]
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 260 219
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) 0.49% [4] 0.62% [4]
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) 2.854% [4] 2.434% [4]
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) 1.165% [4] 1.143% [4]
[1] Excludes derivative assets of $26 million and $1.7 billion and derivative liabilities of $1 million and $1.1 billion recognized in our condensed consolidated balance sheets as of September 30, 2014 and December 31, 2013, respectively, that are not subject to enforceable master netting arrangements.
[2] Excludes estimated recoveries from mortgage insurance proceeds.
[3] Includes Fannie Mae and Freddie Mac securities.
[4] 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.
[5] 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.