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Investments in Securities Available-for-sale Securities 3 (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses $ (12) $ (50)
Less than 12 Consecutive Months, Fair Value 824 1,552
12 Consecutive Months or Longer, Gross Unrealized Losses (38) (31)
12 Consecutive Months or Longer, Fair Value 698 658
Fannie Mae [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (2) (8)
Less than 12 Consecutive Months, Fair Value 288 659
12 Consecutive Months or Longer, Gross Unrealized Losses (28) (22)
12 Consecutive Months or Longer, Fair Value 540 491
Alt-A private-label securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (1) (1)
Less than 12 Consecutive Months, Fair Value 70 26
12 Consecutive Months or Longer, Gross Unrealized Losses (4) (3)
12 Consecutive Months or Longer, Fair Value 52 54
Subprime private-label securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses 0 0
Less than 12 Consecutive Months, Fair Value 0 12
12 Consecutive Months or Longer, Gross Unrealized Losses (5) (4)
12 Consecutive Months or Longer, Fair Value 86 91
CMBS [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (1)  
Less than 12 Consecutive Months, Fair Value 96  
12 Consecutive Months or Longer, Gross Unrealized Losses 0  
12 Consecutive Months or Longer, Fair Value 0  
Mortgage revenue bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (8) (35)
Less than 12 Consecutive Months, Fair Value 370 631
12 Consecutive Months or Longer, Gross Unrealized Losses (1) (2)
12 Consecutive Months or Longer, Fair Value $ 20 22
Other mortgage-related securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses   (6)
Less than 12 Consecutive Months, Fair Value   224
12 Consecutive Months or Longer, Gross Unrealized Losses   0
12 Consecutive Months or Longer, Fair Value   $ 0