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Investments in Securities Available-for-sale Securities 3 (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses $ (11) $ (223)
Less than 12 Consecutive Months, Fair Value 548 3,580
12 Consecutive Months or Longer, Gross Unrealized Losses (436) (660)
12 Consecutive Months or Longer, Fair Value 3,850 3,802
Fannie Mae [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (4) (40)
Less than 12 Consecutive Months, Fair Value 284 975
12 Consecutive Months or Longer, Gross Unrealized Losses (22) (4)
12 Consecutive Months or Longer, Fair Value 673 126
Alt-A private-label securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (3) (12)
Less than 12 Consecutive Months, Fair Value 121 490
12 Consecutive Months or Longer, Gross Unrealized Losses (15) (30)
12 Consecutive Months or Longer, Fair Value 113 308
Subprime private-label securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (2) (24)
Less than 12 Consecutive Months, Fair Value 72 448
12 Consecutive Months or Longer, Gross Unrealized Losses (38) (131)
12 Consecutive Months or Longer, Fair Value 618 1,332
Mortgage revenue bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (2) (147)
Less than 12 Consecutive Months, Fair Value 66 1,662
12 Consecutive Months or Longer, Gross Unrealized Losses (186) (277)
12 Consecutive Months or Longer, Fair Value 1,396 970
Other mortgage-related 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 5 5
12 Consecutive Months or Longer, Gross Unrealized Losses (175) (218)
12 Consecutive Months or Longer, Fair Value $ 1,050 $ 1,066