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Investments in Securities Maturity Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost $ 7,261 $ 18,141
Total fair value 8,363 20,230
One Year or Less, Amortized Cost 782  
One Year or Less, Fair Value 787  
After One Year through Five Years, Amortized Cost 191  
After One Year through Five Years, Fair Value 193  
After Five Years through Ten Years, Amortized Cost 282  
After Five Years through Ten Years, Fair Value 294  
After Ten Years, Amortized Cost 6,006  
After Ten Years, Fair Value $ 7,089  
Weighted average yield 6.78%  
One Year or Less, weighted average yield 4.03%  
After One Year through Five Years, weighted average yield 5.18%  
After Five Years through Ten Years, weighted average yield 6.92%  
After Ten Years, weighted average yield 7.18%  
Fannie Mae [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost $ 2,445 4,008
Total fair value 2,554 4,221
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 26  
After One Year through Five Years, Fair Value 26  
After Five Years through Ten Years, Amortized Cost 62  
After Five Years through Ten Years, Fair Value 67  
After Ten Years, Amortized Cost 2,357  
After Ten Years, Fair Value 2,461  
Freddie Mac [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 474 4,000
Total fair value 509 4,299
One Year or Less, Amortized Cost 2  
One Year or Less, Fair Value 2  
After One Year through Five Years, Amortized Cost 53  
After One Year through Five Years, Fair Value 54  
After Five Years through Ten Years, Amortized Cost 78  
After Five Years through Ten Years, Fair Value 83  
After Ten Years, Amortized Cost 341  
After Ten Years, Fair Value 370  
Ginnie Mae [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 34 343
Total fair value 38 391
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 2  
After Five Years through Ten Years, Fair Value 2  
After Ten Years, Amortized Cost 31  
After Ten Years, Fair Value 35  
Alt-A private-label securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 747 2,029
Total fair value 1,291 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 747  
After Ten Years, Fair Value 1,291  
Subprime private-label securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,070 2,526
Total fair value 1,418 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 1,070  
After Ten Years, Fair Value 1,418  
CMBS [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 815 1,235
Total fair value 819 1,255
One Year or Less, Amortized Cost 766  
One Year or Less, Fair Value 770  
After One Year through Five Years, Amortized Cost 29  
After One Year through Five Years, Fair Value 30  
After Five Years through Ten Years, Amortized Cost 0  
After Five Years through Ten Years, Fair Value 0  
After Ten Years, Amortized Cost 20  
After Ten Years, Fair Value 19  
Mortgage revenue bonds [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,245 2,639
Total fair value 1,272 2,701
One Year or Less, Amortized Cost 14  
One Year or Less, Fair Value 15  
After One Year through Five Years, Amortized Cost 82  
After One Year through Five Years, Fair Value 82  
After Five Years through Ten Years, Amortized Cost 138  
After Five Years through Ten Years, Fair Value 139  
After Ten Years, Amortized Cost 1,011  
After Ten Years, Fair Value 1,036  
Other mortgage-related securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 431 1,361
Total fair value 462 $ 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 0  
After Five Years through Ten Years, Amortized Cost 2  
After Five Years through Ten Years, Fair Value 3  
After Ten Years, Amortized Cost 429  
After Ten Years, Fair Value $ 459