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Investments in Securities Maturity Information (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost $ 1,780 $ 2,281
Total fair value 1,895 2,404
Amortized cost of investments in securities 1,780 2,281
Total fair value 1,895 2,404
Estimated of Fair Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 1,895  
One Year or Less, Fair Value 1  
After One Year through Five Years, Fair Value 36  
After Five Years through Ten Years, Fair Value 159  
After Ten Years, Fair Value 1,699  
Total fair value 1,895  
Carrying Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 1,777  
One Year or Less, Fair Value 1  
After One Year through Five Years, Fair Value 34  
After Five Years through Ten Years, Fair Value 144  
After Ten Years, Fair Value 1,598  
Total fair value 1,777  
Fannie Mae [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,195 1,445
Total fair value 1,283 1,520
Amortized cost of investments in securities 1,195 1,445
Total fair value 1,283 1,520
Fannie Mae [Member] | Estimated of Fair Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 1,283  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 6  
After Five Years through Ten Years, Fair Value 100  
After Ten Years, Fair Value 1,177  
Total fair value 1,283  
Fannie Mae [Member] | Carrying Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 1,195  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 6  
After Five Years through Ten Years, Fair Value 88  
After Ten Years, Fair Value 1,101  
Total fair value 1,195  
Other agency [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 85 183
Total fair value 96 198
Amortized cost of investments in securities 85 183
Total fair value 96 198
Other agency [Member] | Estimated of Fair Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 96  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Fair Value 11  
After Ten Years, Fair Value 85  
Total fair value 96  
Other agency [Member] | Carrying Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 85  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Fair Value 10  
After Ten Years, Fair Value 75  
Total fair value 85  
Alt-A and subprime private-label securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 4 34
Total fair value 6 57
Amortized cost of investments in securities 4 34
Total fair value 6 57
Alt-A and subprime private-label securities [Member] | Estimated of Fair Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 6  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Fair Value 3  
After Ten Years, Fair Value 3  
Total fair value 6  
Alt-A and subprime private-label securities [Member] | Carrying Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 4  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Fair Value 2  
After Ten Years, Fair Value 2  
Total fair value 4  
Mortgage revenue bonds [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 249 309
Total fair value 255 315
Amortized cost of investments in securities 249 309
Total fair value 255 315
Mortgage revenue bonds [Member] | Estimated of Fair Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 255  
One Year or Less, Fair Value 1  
After One Year through Five Years, Fair Value 30  
After Five Years through Ten Years, Fair Value 24  
After Ten Years, Fair Value 200  
Total fair value 255  
Mortgage revenue bonds [Member] | Carrying Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 246  
One Year or Less, Fair Value 1  
After One Year through Five Years, Fair Value 28  
After Five Years through Ten Years, Fair Value 24  
After Ten Years, Fair Value 193  
Total fair value 246  
Other mortgage-related securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 247 310
Total fair value 255 314
Amortized cost of investments in securities 247 310
Total fair value 255 $ 314
Other mortgage-related securities [Member] | Estimated of Fair Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 255  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Fair Value 21  
After Ten Years, Fair Value 234  
Total fair value 255  
Other mortgage-related securities [Member] | Carrying Value [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total fair value 247  
One Year or Less, Fair Value 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Fair Value 20  
After Ten Years, Fair Value 227  
Total fair value $ 247