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Investments in Securities Available-for-sale Securities 2 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 34,073 [1] $ 35,690 [1]
Gross unrealized gains 3,650 3,364
Gross unrealized losses - OTTI (234) [2] (385) [2]
Gross unrealized losses - Other (361) [3] (498) [3]
Available-for-sale, at fair value 37,128 38,171
Fannie Mae [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 5,901 [1] 6,227 [1]
Gross unrealized gains 395 390
Gross unrealized losses - OTTI 0 [2] 0 [2]
Gross unrealized losses - Other (41) [3] (44) [3]
Available-for-sale, at fair value 6,255 6,573
Freddie Mac [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 6,048 [1] 6,365 [1]
Gross unrealized gains 467 477
Gross unrealized losses - OTTI 0 [2] 0 [2]
Gross unrealized losses - Other 0 [3] 0 [3]
Available-for-sale, at fair value 6,515 6,842
Ginnie Mae [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 486 [1] 512 [1]
Gross unrealized gains 71 76
Gross unrealized losses - OTTI 0 [2] 0 [2]
Gross unrealized losses - Other 0 [3] 0 [3]
Available-for-sale, at fair value 557 588
Alt-A private-label securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 6,107 [1] 6,240 [1]
Gross unrealized gains 1,260 1,151
Gross unrealized losses - OTTI (21) [2] (40) [2]
Gross unrealized losses - Other 0 [3] (2) [3]
Available-for-sale, at fair value 7,346 7,349
Subprime private-label securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 5,975 [1] 6,232 [1]
Gross unrealized gains 1,141 991
Gross unrealized losses - OTTI (40) [2] (102) [2]
Gross unrealized losses - Other (46) [3] (53) [3]
Available-for-sale, at fair value 7,030 7,068
CMBS [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 1,490 [1] 1,526 [1]
Gross unrealized gains 79 80
Gross unrealized losses - OTTI 0 [2] 0 [2]
Gross unrealized losses - Other 0 [3] 0 [3]
Available-for-sale, at fair value 1,569 1,606
Mortgage revenue bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 5,205 [1] 5,645 [1]
Gross unrealized gains 57 35
Gross unrealized losses - OTTI (158) [2] (228) [2]
Gross unrealized losses - Other (96) [3] (196) [3]
Available-for-sale, at fair value 5,008 5,256
Other mortgage-related securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 2,861 [1] 2,943 [1]
Gross unrealized gains 180 164
Gross unrealized losses - OTTI (15) [2] (15) [2]
Gross unrealized losses - Other (178) [3] (203) [3]
Available-for-sale, at fair value $ 2,848 $ 2,889
[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.
[2] Represents the noncredit component of other-than-temporary impairments losses recorded in “Accumulated other comprehensive income” as well as cumulative changes in fair value of securities for which we previously recognized the credit component of other-than-temporary impairments.
[3] Represents the gross unrealized losses on securities for which we have not recognized other-than-temporary impairments.