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Investments in Securities Maturity Information (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost $ 6,607 $ 7,261
Total fair value 7,721 8,363
One Year or Less, Amortized Cost 622  
One Year or Less, Fair Value 623  
After One Year through Five Years, Amortized Cost 130  
After One Year through Five Years, Fair Value 131  
After Five Years through Ten Years, Amortized Cost 250  
After Five Years through Ten Years, Fair Value 261  
After Ten Years, Amortized Cost 5,605  
After Ten Years, Fair Value 6,706  
Fannie Mae [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 2,271 2,445
Total fair value 2,373 2,554
One Year or Less, Amortized Cost 1  
One Year or Less, Fair Value 1  
After One Year through Five Years, Amortized Cost 19  
After One Year through Five Years, Fair Value 19  
After Five Years through Ten Years, Amortized Cost 62  
After Five Years through Ten Years, Fair Value 66  
After Ten Years, Amortized Cost 2,189  
After Ten Years, Fair Value 2,287  
Other agency [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 436 508
Total fair value 470 547
One Year or Less, Amortized Cost 1  
One Year or Less, Fair Value 1  
After One Year through Five Years, Amortized Cost 32  
After One Year through Five Years, Fair Value 33  
After Five Years through Ten Years, Amortized Cost 66  
After Five Years through Ten Years, Fair Value 71  
After Ten Years, Amortized Cost 337  
After Ten Years, Fair Value 365  
Alt-A and subprime private-label securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,713 1,817
Total fair value 2,628 2,709
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 1,713  
After Ten Years, Fair Value 2,628  
CMBS [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 616 815
Total fair value 617 819
One Year or Less, Amortized Cost 610  
One Year or Less, Fair Value 611  
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 6  
After Ten Years, Fair Value 6  
Mortgage revenue bonds [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 1,158 1,245
Total fair value 1,185 1,272
One Year or Less, Amortized Cost 10  
One Year or Less, Fair Value 10  
After One Year through Five Years, Amortized Cost 79  
After One Year through Five Years, Fair Value 79  
After Five Years through Ten Years, Amortized Cost 119  
After Five Years through Ten Years, Fair Value 121  
After Ten Years, Amortized Cost 950  
After Ten Years, Fair Value 975  
Other mortgage-related securities [Member]    
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity    
Total amortized cost 413 431
Total fair value 448 $ 462
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 3  
After Five Years through Ten Years, Fair Value 3  
After Ten Years, Amortized Cost 410  
After Ten Years, Fair Value $ 445