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Investments in Securities Maturity Information (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost $ 28,879 [1] $ 35,690 [1]
Available-for-sale, at fair value 32,099 38,171
One Year or Less, Amortized Cost 24  
One Year or Less, Fair Value 24  
After One Year through Five Years, Amortized Cost 2,113  
After One Year through Five Years, Fair Value 2,217  
After Five Years through Ten Years, Amortized Cost 1,277  
After Five Years through Ten Years, Fair Value 1,360  
After Ten Years, Amortized Cost 25,465  
After Ten Years, Fair Value 28,498  
Fannie Mae [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 5,443 [1] 6,227 [1]
Available-for-sale, at fair value 5,756 6,573
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 285  
After One Year through Five Years, Fair Value 300  
After Five Years through Ten Years, Amortized Cost 271  
After Five Years through Ten Years, Fair Value 292  
After Ten Years, Amortized Cost 4,887  
After Ten Years, Fair Value 5,164  
Freddie Mac [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 5,365 [1] 6,365 [1]
Available-for-sale, at fair value 5,812 6,842
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 309  
After One Year through Five Years, Fair Value 327  
After Five Years through Ten Years, Amortized Cost 523  
After Five Years through Ten Years, Fair Value 571  
After Ten Years, Amortized Cost 4,533  
After Ten Years, Fair Value 4,914  
Ginnie Mae [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 436 [1] 512 [1]
Available-for-sale, at fair value 498 588
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 65  
After Five Years through Ten Years, Fair Value 74  
After Ten Years, Amortized Cost 371  
After Ten Years, Fair Value 424  
Alt-A private-label securities [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 5,071 [1] 6,240 [1]
Available-for-sale, at fair value 6,169 7,349
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 5,071  
After Ten Years, Fair Value 6,169  
Subprime private-label securities [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 4,280 [1] 6,232 [1]
Available-for-sale, at fair value 5,386 7,068
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 4,280  
After Ten Years, Fair Value 5,386  
CMBS [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 1,401 [1] 1,526 [1]
Available-for-sale, at fair value 1,467 1,606
One Year or Less, Amortized Cost 0  
One Year or Less, Fair Value 0  
After One Year through Five Years, Amortized Cost 1,321  
After One Year through Five Years, Fair Value 1,385  
After Five Years through Ten Years, Amortized Cost 0  
After Five Years through Ten Years, Fair Value 0  
After Ten Years, Amortized Cost 80  
After Ten Years, Fair Value 82  
Mortgage revenue bonds [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 4,174 [1] 5,645 [1]
Available-for-sale, at fair value 4,266 5,256
One Year or Less, Amortized Cost 24  
One Year or Less, Fair Value 24  
After One Year through Five Years, Amortized Cost 198  
After One Year through Five Years, Fair Value 202  
After Five Years through Ten Years, Amortized Cost 380  
After Five Years through Ten Years, Fair Value 383  
After Ten Years, Amortized Cost 3,572  
After Ten Years, Fair Value 3,657  
Other mortgage-related securities [Member]
   
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Amortized cost 2,709 [1] 2,943 [1]
Available-for-sale, at fair value 2,745 2,889
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 3  
After Five Years through Ten Years, Amortized Cost 38  
After Five Years through Ten Years, Fair Value 40  
After Ten Years, Amortized Cost 2,671  
After Ten Years, Fair Value $ 2,702  
[1] Amortized cost consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments as well as net other-than-temporary impairments (“OTTI”) recognized in our condensed consolidated statements of operations and comprehensive income.