XML 76 R68.htm IDEA: XBRL DOCUMENT v2.4.0.6
Investments in Securities Available-for-sale Securities 3 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months, Gross Unrealized Losses $ (21) $ (43)
Less Than 12 Consecutive Months, Fair Value 1,202 1,605
12 Consecutive Months or Longer, Gross Unrealized Losses (1,311) (2,006)
12 Consecutive Months or Longer, Fair Value 11,040 12,862
Fannie Mae [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months, Gross Unrealized Losses (1) (5)
Less Than 12 Consecutive Months, Fair Value 67 599
12 Consecutive Months or Longer, Gross Unrealized Losses (7) (11)
12 Consecutive Months or Longer, Fair Value 303 372
Alt-A private-label securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months, Gross Unrealized Losses (8) (18)
Less Than 12 Consecutive Months, Fair Value 671 541
12 Consecutive Months or Longer, Gross Unrealized Losses (454) (715)
12 Consecutive Months or Longer, Fair Value 3,601 4,465
Subprime private-label securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months, Gross Unrealized Losses (7) (14)
Less Than 12 Consecutive Months, Fair Value 198 243
12 Consecutive Months or Longer, Gross Unrealized Losses (484) (893)
12 Consecutive Months or Longer, Fair Value 4,218 5,058
CMBS [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 0
12 Consecutive Months or Longer, Gross Unrealized Losses (6) (11)
12 Consecutive Months or Longer, Fair Value 191 240
Mortgage revenue bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months, Gross Unrealized Losses (5) (3)
Less Than 12 Consecutive Months, Fair Value 266 127
12 Consecutive Months or Longer, Gross Unrealized Losses (103) (94)
12 Consecutive Months or Longer, Fair Value 1,187 1,198
Other mortgage-related securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months, Gross Unrealized Losses 0 (3)
Less Than 12 Consecutive Months, Fair Value 0 95
12 Consecutive Months or Longer, Gross Unrealized Losses (257) (282)
12 Consecutive Months or Longer, Fair Value $ 1,540 $ 1,529