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Investments in Securities Maturity Information (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost $ 15,199 $ 18,141
Total fair value 16,983 20,230
One Year or Less, Amortized Cost 209  
One Year or Less, Fair Value 210  
After One Year through Five Years, Amortized Cost 1,232  
After One Year through Five Years, Fair Value 1,257  
After Five Years through Ten Years, Amortized Cost 608  
After Five Years through Ten Years, Fair Value 651  
After Ten Years, Amortized Cost 13,150  
After Ten Years, Fair Value 14,865  
Fannie Mae [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 3,719 4,008
Total fair value 3,913 4,221
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 94  
After One Year through Five Years, Fair Value 96  
After Five Years through Ten Years, Amortized Cost 104  
After Five Years through Ten Years, Fair Value 112  
After Ten Years, Amortized Cost 3,521  
After Ten Years, Fair Value 3,705  
Freddie Mac [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 3,449 4,000
Total fair value 3,701 4,299
One Year or Less, Amortized Cost 1  
One Year or Less, Fair Value 1  
After One Year through Five Years, Amortized Cost 158  
After One Year through Five Years, Fair Value 163  
After Five Years through Ten Years, Amortized Cost 291  
After Five Years through Ten Years, Fair Value 319  
After Ten Years, Amortized Cost 2,999  
After Ten Years, Fair Value 3,218  
Ginnie Mae [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 221 343
Total fair value 254 391
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 1  
After One Year through Five Years, Fair Value 1  
After Five Years through Ten Years, Amortized Cost 30  
After Five Years through Ten Years, Fair Value 34  
After Ten Years, Amortized Cost 190  
After Ten Years, Fair Value 219  
Alt-A private-label securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,356 2,029
Total fair value 1,920 2,678
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Amortized Cost 0  
After Five Years through Ten Years, Fair Value 0  
After Ten Years, Amortized Cost 1,356  
After Ten Years, Fair Value 1,920  
Subprime private-label securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,929 2,526
Total fair value 2,544 3,281
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 0  
After One Year through Five Years, Fair Value 0  
After Five Years through Ten Years, Amortized Cost 0  
After Five Years through Ten Years, Fair Value 0  
After Ten Years, Amortized Cost 1,929  
After Ten Years, Fair Value 2,544  
CMBS [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,131 1,235
Total fair value 1,147 1,255
One Year or Less, Amortized Cost 197  
One Year or Less, Fair Value 198  
After One Year through Five Years, Amortized Cost 882  
After One Year through Five Years, Fair Value 898  
After Five Years through Ten Years, Amortized Cost 0  
After Five Years through Ten Years, Fair Value 0  
After Ten Years, Amortized Cost 52  
After Ten Years, Fair Value 51  
Mortgage revenue bonds [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 2,473 2,639
Total fair value 2,564 2,701
One Year or Less, Amortized Cost 11  
One Year or Less, Fair Value 11  
After One Year through Five Years, Amortized Cost 97  
After One Year through Five Years, Fair Value 98  
After Five Years through Ten Years, Amortized Cost 180  
After Five Years through Ten Years, Fair Value 183  
After Ten Years, Amortized Cost 2,185  
After Ten Years, Fair Value 2,272  
Other mortgage-related securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 921 1,361
Total fair value 940 $ 1,404
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 0  
After One Year through Five Years, Fair Value 1  
After Five Years through Ten Years, Amortized Cost 3  
After Five Years through Ten Years, Fair Value 3  
After Ten Years, Amortized Cost 918  
After Ten Years, Fair Value $ 936