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Investments in Securities Available-for-sale Securities 3 (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses $ (23) $ (4)
Less than 12 Consecutive Months, Fair Value 1,125 339
12 Consecutive Months or Longer, Gross Unrealized Losses (28) (203)
12 Consecutive Months or Longer, Fair Value 655 2,375
Fannie Mae [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (3) 0
Less than 12 Consecutive Months, Fair Value 116 113
12 Consecutive Months or Longer, Gross Unrealized Losses (16) (19)
12 Consecutive Months or Longer, Fair Value 511 627
Alt-A private-label securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (1) (2)
Less than 12 Consecutive Months, Fair Value 132 171
12 Consecutive Months or Longer, Gross Unrealized Losses (3) (13)
12 Consecutive Months or Longer, Fair Value 28 112
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 38 0
12 Consecutive Months or Longer, Gross Unrealized Losses (5) (24)
12 Consecutive Months or Longer, Fair Value 96 460
Mortgage revenue bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (16) (2)
Less than 12 Consecutive Months, Fair Value 584 47
12 Consecutive Months or Longer, Gross Unrealized Losses (4) (11)
12 Consecutive Months or Longer, Fair Value 20 155
Other mortgage-related securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Consecutive Months, Gross Unrealized Losses (3) 0
Less than 12 Consecutive Months, Fair Value 255 8
12 Consecutive Months or Longer, Gross Unrealized Losses 0 (136)
12 Consecutive Months or Longer, Fair Value $ 0 $ 1,021