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Details of Certain Items Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, Available-for-sale, USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 84,540 $ 78,467
Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 258 [1] 273 [1]
Alt-A RMBS | 2006-2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 97 [1] 99 [1]
Alt-A RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 101 [1] 113 [1]
Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 60 [1] 61 [1]
Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 764 [1] 815 [1]
Prime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 109 [1] 121 [1]
Prime RMBS | 2006
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 72 [1] 75 [1]
Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 223 [1] 230 [1]
Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 360 [1] 389 [1]
Subprime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 422 [1] 418 [1]
Subprime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1 [1] 2 [1]
Subprime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 94 [1] 82 [1]
Subprime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 327 [1] 334 [1]
Commercial MBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,320 3,339
Commercial MBS | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,320 [1] 3,005 [1]
Commercial MBS | 2009-2012 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 198 [1] 200 [1]
Commercial MBS | 2008 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 25 [1] 25 [1]
Commercial MBS | 2007 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 867 [1] 789 [1]
Commercial MBS | 2006 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,038 [1] 892 [1]
Commercial MBS | 2005 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 796 [1] 696 [1]
Commercial MBS | 2004 and earlier | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 396 [1] 403 [1]
Foreign Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,928 [1] 2,425 [1]
Foreign Covered Bonds | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,299 [1] 1,461 [1]
Foreign Covered Bonds | Canada
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 963 [1] 795 [1]
Foreign Covered Bonds | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 660 [1] 25 [1]
Foreign Covered Bonds | Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,006 [1] 144 [1]
European Floating Rate Notes
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,848 [1] 1,429 [1]
European Floating Rate Notes | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 62 [1] 93 [1]
European Floating Rate Notes | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,550 [1] 686 [1]
European Floating Rate Notes | Netherlands
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 804 [1] 47 [1]
European Floating Rate Notes | Ireland
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 182 [1] 203 [1]
European Floating Rate Notes | Italy
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 133 [1] 150 [1]
European Floating Rate Notes | Luxembourg
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale   140 [1]
European Floating Rate Notes | Australia
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 85 [1] 101 [1]
European Floating Rate Notes | Spain
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 23 [1]  
European Floating Rate Notes | France
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 9 [1] 9 [1]
Sovereign Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 9,029 [1] 11,954 [1]
Sovereign Debt | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 489 [1] 2,347 [1]
Sovereign Debt | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,738 [1] 4,526 [1]
Sovereign Debt | Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 56 [1] 61 [1]
Sovereign Debt | Netherlands
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,182 [1] 2,230 [1]
Sovereign Debt | France
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,564 [1] 2,790 [1]
Grantor Trust Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,863 [1],[2] 1,879 [1],[2]
Grantor Trust Alt-A RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 552 [1],[2] 554 [1],[2]
Grantor Trust Alt-A RMBS | 2006
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 495 [1],[2] 488 [1],[2]
Grantor Trust Alt-A RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 606 [1],[2] 628 [1],[2]
Grantor Trust Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 210 [1],[2] 209 [1],[2]
Grantor Trust Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,059 [1],[2] 1,175 [1],[2]
Grantor Trust Prime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 327 [1],[2] 370 [1],[2]
Grantor Trust Prime RMBS | 2006
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 285 [1],[2] 308 [1],[2]
Grantor Trust Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 414 [1],[2] 465 [1],[2]
Grantor Trust Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 33 [1],[2] 32 [1],[2]
Grantor Trust Sub Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 115 [1],[2] 125 [1],[2]
Grantor Trust Sub Prime RMBS | 2005-2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 80 [1],[2] 88 [1],[2]
Grantor Trust Sub Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 35 [1],[2] $ 37 [1],[2]
Ratings, AAA/AA- | Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 6.00% 6.00%
Ratings, AAA/AA- | Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 24.00% 27.00%
Ratings, AAA/AA- | Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 25.00% 28.00%
Ratings, AAA/AA- | Prime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 42.00% 38.00%
Ratings, AAA/AA- | Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 33.00% 32.00%
Ratings, AAA/AA- | Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 21.00% 29.00%
Ratings, AAA/AA- | Subprime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 7.00% 8.00%
Ratings, AAA/AA- | Subprime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 22.00% 23.00%
Ratings, AAA/AA- | Subprime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 3.00% 5.00%
Ratings, AAA/AA- | Commercial MBS | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 77.00% 84.00%
Ratings, AAA/AA- | Commercial MBS | 2009-2012 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Commercial MBS | 2008 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 15.00% 16.00%
Ratings, AAA/AA- | Commercial MBS | 2007 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 49.00% 66.00%
Ratings, AAA/AA- | Commercial MBS | 2006 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 78.00% 85.00%
Ratings, AAA/AA- | Commercial MBS | 2005 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 94.00% 94.00%
Ratings, AAA/AA- | Commercial MBS | 2004 and earlier | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 95.00% 97.00%
Ratings, AAA/AA- | Foreign Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Foreign Covered Bonds | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 99.00% 99.00%
Ratings, AAA/AA- | Foreign Covered Bonds | Canada
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Foreign Covered Bonds | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Foreign Covered Bonds | Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | European Floating Rate Notes
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 80.00% 55.00%
Ratings, AAA/AA- | European Floating Rate Notes | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   21.00%
Ratings, AAA/AA- | European Floating Rate Notes | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 78.00% 72.00%
Ratings, AAA/AA- | European Floating Rate Notes | Netherlands
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 35.00%
Ratings, AAA/AA- | European Floating Rate Notes | Ireland
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 12.00%  
Ratings, AAA/AA- | European Floating Rate Notes | Italy
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | European Floating Rate Notes | Australia
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 93.00% 91.00%
Ratings, AAA/AA- | European Floating Rate Notes | Spain
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00%  
Ratings, AAA/AA- | European Floating Rate Notes | France
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Sovereign Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Sovereign Debt | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Sovereign Debt | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Sovereign Debt | Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 98.00% 97.00%
Ratings, AAA/AA- | Sovereign Debt | Netherlands
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Sovereign Debt | France
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, AAA/AA- | Grantor Trust Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% [2] 2.00% [2]
Ratings, AAA/AA- | Grantor Trust Alt-A RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00% [2] 5.00% [2]
Ratings, AAA/AA- | Grantor Trust Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% [2]  
Ratings, AAA/AA- | Grantor Trust Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 5.00% [2] 9.00% [2]
Ratings, AAA/AA- | Grantor Trust Sub Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 2.00% [2] 2.00% [2]
Ratings, AAA/AA- | Grantor Trust Sub Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 6.00% [2] 5.00% [2]
Ratings, A+/A- | Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 3.00% 3.00%
Ratings, A+/A- | Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 14.00% 13.00%
Ratings, A+/A- | Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 20.00% 19.00%
Ratings, A+/A- | Prime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00% 4.00%
Ratings, A+/A- | Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 41.00% 38.00%
Ratings, A+/A- | Subprime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 8.00% 14.00%
Ratings, A+/A- | Subprime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   2.00%
Ratings, A+/A- | Subprime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 12.00% 12.00%
Ratings, A+/A- | Subprime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 7.00% 15.00%
Ratings, A+/A- | Commercial MBS | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 19.00% 14.00%
Ratings, A+/A- | Commercial MBS | 2008 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 85.00% 84.00%
Ratings, A+/A- | Commercial MBS | 2007 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 37.00% 26.00%
Ratings, A+/A- | Commercial MBS | 2006 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 22.00% 15.00%
Ratings, A+/A- | Commercial MBS | 2005 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 6.00% 6.00%
Ratings, A+/A- | Commercial MBS | 2004 and earlier | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00% 2.00%
Ratings, A+/A- | Foreign Covered Bonds | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% 1.00%
Ratings, A+/A- | European Floating Rate Notes
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 12.00% 34.00%
Ratings, A+/A- | European Floating Rate Notes | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 10.00% 6.00%
Ratings, A+/A- | European Floating Rate Notes | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 21.00% 28.00%
Ratings, A+/A- | European Floating Rate Notes | Netherlands
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   65.00%
Ratings, A+/A- | European Floating Rate Notes | Ireland
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   50.00%
Ratings, A+/A- | European Floating Rate Notes | Luxembourg
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   100.00%
Ratings, A+/A- | European Floating Rate Notes | Australia
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 7.00% 9.00%
Ratings, A+/A- | Sovereign Debt | Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 2.00% 3.00%
Ratings, A+/A- | Grantor Trust Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% [2]  
Ratings, A+/A- | Grantor Trust Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00% [2] 4.00% [2]
Ratings, A+/A- | Grantor Trust Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% [2] 2.00% [2]
Ratings, A+/A- | Grantor Trust Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 2.00% [2] 4.00% [2]
Ratings, A+/A- | Grantor Trust Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 3.00% [2]  
Ratings, A+/A- | Grantor Trust Sub Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   10.00% [2]
Ratings, A+/A- | Grantor Trust Sub Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value   34.00% [2]
Ratings, BBB+/BBB- | Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 9.00% 11.00%
Ratings, BBB+/BBB- | Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 38.00% 47.00%
Ratings, BBB+/BBB- | Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 3.00% 5.00%
Ratings, BBB+/BBB- | Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 6.00% 11.00%
Ratings, BBB+/BBB- | Subprime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 18.00% 21.00%
Ratings, BBB+/BBB- | Subprime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 98.00%
Ratings, BBB+/BBB- | Subprime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 26.00% 29.00%
Ratings, BBB+/BBB- | Subprime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 15.00% 18.00%
Ratings, BBB+/BBB- | Commercial MBS | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00% 2.00%
Ratings, BBB+/BBB- | Commercial MBS | 2007 | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 14.00% 8.00%
Ratings, BBB+/BBB- | Commercial MBS | 2004 and earlier | Domestic
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% 1.00%
Ratings, BBB+/BBB- | European Floating Rate Notes
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00% 11.00%
Ratings, BBB+/BBB- | European Floating Rate Notes | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 89.00% 73.00%
Ratings, BBB+/BBB- | European Floating Rate Notes | United Kingdom
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00%  
Ratings, BBB+/BBB- | European Floating Rate Notes | Ireland
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 22.00% 47.00%
Ratings, BBB+/BBB- | Grantor Trust Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 3.00% [2] 3.00% [2]
Ratings, BBB+/BBB- | Grantor Trust Alt-A RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% [2] 1.00% [2]
Ratings, BBB+/BBB- | Grantor Trust Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 23.00% [2] 27.00% [2]
Ratings, BBB+/BBB- | Grantor Trust Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00% [2] 1.00% [2]
Ratings, BBB+/BBB- | Grantor Trust Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 23.00% [2] 22.00% [2]
Ratings, BBB+/BBB- | Grantor Trust Sub Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 3.00% [2]  
Ratings, BBB+/BBB- | Grantor Trust Sub Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 34.00% [2]  
Ratings, BB+ and lower | Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 82.00% 80.00%
Ratings, BB+ and lower | Alt-A RMBS | 2006-2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, BB+ and lower | Alt-A RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, BB+ and lower | Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 24.00% 13.00%
Ratings, BB+ and lower | Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 52.00% 48.00%
Ratings, BB+ and lower | Prime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 54.00% 58.00%
Ratings, BB+ and lower | Prime RMBS | 2006
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% 100.00%
Ratings, BB+ and lower | Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 67.00% 68.00%
Ratings, BB+ and lower | Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 32.00% 22.00%
Ratings, BB+ and lower | Subprime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 67.00% 57.00%
Ratings, BB+ and lower | Subprime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 40.00% 36.00%
Ratings, BB+ and lower | Subprime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 75.00% 62.00%
Ratings, BB+ and lower | European Floating Rate Notes
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 4.00%  
Ratings, BB+ and lower | European Floating Rate Notes | Germany
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 1.00%  
Ratings, BB+ and lower | European Floating Rate Notes | Ireland
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 66.00% 3.00%
Ratings, BB+ and lower | Grantor Trust Alt-A RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 95.00% [2] 95.00% [2]
Ratings, BB+ and lower | Grantor Trust Alt-A RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% [2] 100.00% [2]
Ratings, BB+ and lower | Grantor Trust Alt-A RMBS | 2006
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% [2] 100.00% [2]
Ratings, BB+ and lower | Grantor Trust Alt-A RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 95.00% [2] 94.00% [2]
Ratings, BB+ and lower | Grantor Trust Alt-A RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 73.00% [2] 69.00% [2]
Ratings, BB+ and lower | Grantor Trust Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 98.00% [2] 97.00% [2]
Ratings, BB+ and lower | Grantor Trust Prime RMBS | 2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% [2] 100.00% [2]
Ratings, BB+ and lower | Grantor Trust Prime RMBS | 2006
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% [2] 100.00% [2]
Ratings, BB+ and lower | Grantor Trust Prime RMBS | 2005
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 97.00% [2] 96.00% [2]
Ratings, BB+ and lower | Grantor Trust Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 69.00% [2] 69.00% [2]
Ratings, BB+ and lower | Grantor Trust Sub Prime RMBS
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 95.00% [2] 88.00% [2]
Ratings, BB+ and lower | Grantor Trust Sub Prime RMBS | 2005-2007
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 100.00% [2] 100.00% [2]
Ratings, BB+ and lower | Grantor Trust Sub Prime RMBS | 2004 and earlier
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Percentage of fair value 60.00% [2] 61.00% [2]
[1] At June 30, 2012 and Dec. 31, 2011, the German foreign covered bonds were considered Level 1 in the valuation hierarchy. All other assets in the table above are primarily Level 2 assets in the valuation hierarchy.
[2] Previously included in the Grantor Trust.