XML 61 R56.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Investment Securities (Details 2) (USD $)
In Millions
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months $ 1,647 $ 2,905
Estimated Fair Value, 12 months or more 1,094 1,079
Estimated Fair Value, Total 2,741 3,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (73) (159)
Gross Unrealized Losses, 12 months or more (174) (212)
Gross Unrealized Losses, Total (247) (371)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months 291 505
Number of securities, 12 months or more 137 146
Number of securities, total 428 651
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months 1,576 2,554
Estimated Fair Value, 12 months or more 353 79
Estimated Fair Value, Total 1,929 2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (61) (113)
Gross Unrealized Losses, 12 months or more (30) (7)
Gross Unrealized Losses, Total (91) (120)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months 280 457
Number of securities, 12 months or more 64 31
Number of securities, total 344 488
Ratio Of Fair Value To Amortized Cost Less Than Ninety Percent [Member]
   
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Estimated Fair Value, Less than 12 months 71 351
Estimated Fair Value, 12 months or more 741 1,000
Estimated Fair Value, Total 812 1,351
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Gross Unrealized Losses, Less than 12 months (12) (46)
Gross Unrealized Losses, 12 months or more (144) (205)
Gross Unrealized Losses, Total $ (156) $ (251)
Available For Sale Securities Continuous Unrealized Loss Position Qualitative Disclosure [Abstract]    
Number of securities, less than 12 months 11 48
Number of securities, 12 months or more 73 115
Number of securities, total 84 163