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Investments in Securities Available-for-sale Securities 3 (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses $ (6) $ (50)
Less than 12 Consecutive Months, Fair Value 275 1,552
12 Consecutive Months or Longer, Gross Unrealized Losses (24) (31)
12 Consecutive Months or Longer, Fair Value 583 658
Fannie Mae [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (1) (8)
Less than 12 Consecutive Months, Fair Value 85 659
12 Consecutive Months or Longer, Gross Unrealized Losses (19) (22)
12 Consecutive Months or Longer, Fair Value 502 491
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 38 26
12 Consecutive Months or Longer, Gross Unrealized Losses 0 (3)
12 Consecutive Months or Longer, Fair Value 0 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 (4) (4)
12 Consecutive Months or Longer, Fair Value 76 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 136  
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 (3) (35)
Less than 12 Consecutive Months, Fair Value 16 631
12 Consecutive Months or Longer, Gross Unrealized Losses (1) (2)
12 Consecutive Months or Longer, Fair Value $ 5 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