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Investments in Securities Available-for-sale Securities 2 (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost $ 6,607 $ 7,261
Gross unrealized gains 1,148 1,142
Gross unrealized losses (34) (40)
Available-for-sale, at fair value 7,721 8,363
Fannie Mae [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 2,271 2,445
Gross unrealized gains 128 137
Gross unrealized losses (26) (28)
Available-for-sale, at fair value 2,373 2,554
Other agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 436 508
Gross unrealized gains 34 39
Gross unrealized losses 0 0
Available-for-sale, at fair value 470 547
Alt-A and subprime private-label securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 1,713 1,817
Gross unrealized gains 917 895
Gross unrealized losses (2) (3)
Available-for-sale, at fair value 2,628 2,709
CMBS [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 616 815
Gross unrealized gains 1 4
Gross unrealized losses 0 0
Available-for-sale, at fair value 617 819
Mortgage revenue bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 1,158 1,245
Gross unrealized gains 33 36
Gross unrealized losses (6) (9)
Available-for-sale, at fair value 1,185 1,272
Other mortgage-related securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total amortized cost 413 431
Gross unrealized gains 35 31
Gross unrealized losses 0 0
Available-for-sale, at fair value $ 448 $ 462