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Fair Value Level 3 Valuation Inputs - Recurring (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 10,596 $ 12,057
Net derivatives 150 654
Fannie Mae [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (8,186) (9,582)
Consolidated Trusts [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (30,493) (36,524)
Recurring Fair Value Measurements [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 34,679 40,562
Available-for-sale securities 4,843 8,363
Mortgage loans held for investment, at fair value 10,596 12,057
Long-term debt (38,679) (46,106)
Recurring Fair Value Measurements [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 453 636
Available-for-sale securities 1,314 2,709
Recurring Fair Value Measurements [Member] | Mortgage revenue bonds [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1 21
Available-for-sale securities 671 1,272
Recurring Fair Value Measurements [Member] | Other [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 367 462
Recurring Fair Value Measurements [Member] | Fannie Mae [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (8,186) (9,582)
Recurring Fair Value Measurements [Member] | Fannie Mae [Member] | Senior floating [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (8,186) (9,582)
Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (30,493) (36,524)
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1,201 1,127
Available-for-sale securities 1,313 2,153
Mortgage loans held for investment, at fair value 315,719 316,742
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (837) (770)
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (40,683) (36,668)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1,201 1,127
Available-for-sale securities 1,313 2,153
Mortgage loans held for investment, at fair value 1,116 1,197
Net derivatives 134 44
Long-term debt (958) (588)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Agency [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1,006 835
Available-for-sale securities 208 235
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 194 271
Available-for-sale securities 77 217
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Mortgage revenue bonds [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 1 21
Available-for-sale securities 671 1,272
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities 357 429
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with inputs [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   $ 232
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with inputs [Member] | Alt-A and subprime private-label securities [Member] | Trading securities [Member] | Minimum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   0.40%
Prepayment Speed (%)   4.30%
Severity (%)   71.00%
Spread (bps)   2.446%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with inputs [Member] | Alt-A and subprime private-label securities [Member] | Trading securities [Member] | Maximum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   10.90%
Prepayment Speed (%)   7.40%
Severity (%)   95.00%
Spread (bps)   2.539%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus with inputs [Member] | Alt-A and subprime private-label securities [Member] | Trading securities [Member] | Weighted Average [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   8.20%
Prepayment Speed (%)   6.60%
Severity (%)   88.90%
Spread (bps)   2.515%
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   $ 47
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 (%)   0.50%
Prepayment Speed (%)   2.50%
Severity (%)   20.00%
Spread (bps)   2.216%
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 (%)   3.50%
Prepayment Speed (%)   6.00%
Severity (%)   88.00%
Spread (bps)   3.002%
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 (%)   3.50%
Prepayment Speed (%)   2.50%
Severity (%)   87.50%
Spread (bps)   2.377%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus without inputs [Member] | Agency [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities   $ 809
Available-for-sale securities   72
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consensus without inputs [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 154 39
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted cash flow with inputs [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities   $ 45
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted cash flow with inputs [Member] | Alt-A and subprime private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Spread (bps)   3.61%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted cash flow with inputs [Member] | Alt-A and subprime private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Spread (bps)   4.50%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted cash flow with inputs [Member] | Alt-A and subprime private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Spread (bps)   4.06%
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   $ 19
Available-for-sale securities   $ 435
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]    
Spread (bps)   0.13%
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]    
Spread (bps)   2.682%
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]    
Spread (bps)   2.522%
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]    
Spread (bps)   (0.168%)
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]    
Spread (bps)   3.911%
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]    
Spread (bps)   2.60%
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]    
Available-for-sale securities $ 325 $ 348
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 (%)   2.30%
Prepayment Speed (%) 1.60% 0.50%
Severity (%) 50.00% 95.00%
Spread (bps) 0.848% 1.90%
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 (%)   2.30%
Prepayment Speed (%) 2.50% 0.50%
Severity (%) 88.00% 95.00%
Spread (bps) 6.07% 4.50%
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 (%)   2.30%
Prepayment Speed (%) 2.50% 0.50%
Severity (%) 86.60% 95.00%
Spread (bps) 5.779% 4.491%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Discounted cash flow without inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Net derivatives   $ 21
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 $ 971  
Available-for-sale securities $ 112 $ 129
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 (%) 0.00%  
Spread (bps) 0.515%  
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 (%) 177.00%  
Spread (bps) 3.75%  
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 (%) 160.00%  
Spread (bps) 2.001%  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Agency [Member] | Available-for-sale securities [Member] | Minimum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 0.00% 124.80%
Spread (bps) 1.50% 1.75%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Agency [Member] | Available-for-sale securities [Member] | Maximum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 175.70% 165.50%
Spread (bps) 2.10% 2.10%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Agency [Member] | Available-for-sale securities [Member] | Weighted Average [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Prepayment Speed (%) 147.10% 142.40%
Spread (bps) 1.823% 1.825%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Available-for-sale securities   $ 93
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Alt-A and subprime private-label securities [Member] | Available-for-sale securities [Member] | Minimum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   2.50%
Prepayment Speed (%)   3.00%
Severity (%)   38.00%
Spread (bps)   2.661%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Alt-A and subprime private-label securities [Member] | Available-for-sale securities [Member] | Maximum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   8.00%
Prepayment Speed (%)   11.00%
Severity (%)   80.00%
Spread (bps)   3.068%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single vendor with inputs [Member] | Alt-A and subprime private-label securities [Member] | Available-for-sale securities [Member] | Weighted Average [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Default Rate (%)   3.80%
Prepayment Speed (%)   4.90%
Severity (%)   48.10%
Spread (bps)   2.971%
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 $ 475 $ 684
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]    
Spread (bps) (0.17%) (0.168%)
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]    
Spread (bps) 2.48% 3.369%
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]    
Spread (bps) 0.39% 0.443%
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   $ 126
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Internal model [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Net derivatives   10
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Dealer mark without inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Net derivatives $ 113 89
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other valuation technique [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Net derivatives 21 (76)
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 35 26
Available-for-sale securities 96 34
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Other valuation technique [Member] | Alt-A and subprime private-label securities [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Trading securities 40  
Available-for-sale securities 77 79
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 1 2
Available-for-sale securities 196 27
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 32 34
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single-Family [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 958 1,034
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single-Family [Member] | Consensus without inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 344 300
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single-Family [Member] | Build-Up without inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 406 516
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Single-Family [Member] | Other valuation technique [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 208 218
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Multifamily [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 158  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Multifamily [Member] | Build-Up with inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 155 $ 163
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Multifamily [Member] | Build-Up with inputs [Member] | Mortgage loans [Member] | Minimum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Spread (bps) 0.29% 0.55%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Multifamily [Member] | Build-Up with inputs [Member] | Mortgage loans [Member] | Maximum [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Spread (bps) 2.672% 3.052%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Multifamily [Member] | Build-Up with inputs [Member] | Mortgage loans [Member] | Weighted Average [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Spread (bps) 1.058% 1.402%
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Multifamily [Member] | Other valuation technique [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 3  
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Fannie Mae [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (376) $ (347)
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 (376) (347)
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 (376) (347)
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member] | Consolidated Trusts [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Long-term debt (582) (241)
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 $ (401)  
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 (%) 1.60%  
Prepayment Speed (%) 5.40%  
Severity (%) 28.00%  
Spread (bps) 0.42%  
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 (%) 6.30%  
Prepayment Speed (%) 100.00%  
Severity (%) 95.00%  
Spread (bps) 2.283%  
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 (%) 4.60%  
Prepayment Speed (%) 98.90%  
Severity (%) 71.50%  
Spread (bps) 0.787%  
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 $ (181) $ (241)