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Investments in Securities Available-for-sale Securities 2 (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost $ 19,587 $ 27,413
Gross unrealized gains 2,471 3,448
Gross unrealized losses - OTTI (24) (55)
Gross unrealized losses - Other (27) (152)
Total Available-for-Sale, at Fair Value 22,007 30,654
Fannie Mae [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 4,026 5,330
Gross unrealized gains 275 328
Gross unrealized losses - OTTI 0 0
Gross unrealized losses - Other (19) (19)
Total Available-for-Sale, at Fair Value 4,282 5,639
Freddie Mac [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 4,252 5,100
Gross unrealized gains 347 428
Gross unrealized losses - OTTI 0 0
Gross unrealized losses - Other 0 0
Total Available-for-Sale, at Fair Value 4,599 5,528
Ginnie Mae [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 361 416
Gross unrealized gains 52 60
Gross unrealized losses - OTTI 0 0
Gross unrealized losses - Other 0 0
Total Available-for-Sale, at Fair Value 413 476
Alt-A private-label securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 2,626 4,638
Gross unrealized gains 727 1,055
Gross unrealized losses - OTTI (4) (15)
Gross unrealized losses - Other 0 0
Total Available-for-Sale, at Fair Value 3,349 5,678
Subprime private-label securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 2,817 4,103
Gross unrealized gains 865 1,161
Gross unrealized losses - OTTI 0 (9)
Gross unrealized losses - Other (5) (15)
Total Available-for-Sale, at Fair Value 3,677 5,240
CMBS [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 1,273 1,341
Gross unrealized gains 36 56
Gross unrealized losses - OTTI 0 0
Gross unrealized losses - Other 0 0
Total Available-for-Sale, at Fair Value 1,309 1,397
Mortgage revenue bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 2,824 3,859
Gross unrealized gains 129 177
Gross unrealized losses - OTTI (17) (8)
Gross unrealized losses - Other (3) (5)
Total Available-for-Sale, at Fair Value 2,933 4,023
Other mortgage-related securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 1,408 2,626
Gross unrealized gains 40 183
Gross unrealized losses - OTTI (3) (23)
Gross unrealized losses - Other 0 (113)
Total Available-for-Sale, at Fair Value $ 1,445 $ 2,673