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Loans - Home Loans: Risk Profile by Vintage, Geography, Lien Priority and Interest Rate Type (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Home Loans Risk Profile [Line Items]    
Mortgage loans $ 36,817 $ 44,100
% of Total Home Loans 100.00% 100.00%
Origination Year 2005 or Before [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 7,187 8,341
% of Total Home Loans 19.50% 18.90%
Origination Year 2006 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 3,101 3,486
% of Total Home Loans 8.40% 7.90%
Origination Year 2007 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 5,838 6,635
% of Total Home Loans 15.80% 15.00%
Origination Year 2008 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,530 5,467
% of Total Home Loans 12.30% 12.40%
Origination Year 2009 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,832 3,605
% of Total Home Loans 7.70% 8.20%
Origination Year 2010 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,659 6,212
% of Total Home Loans 12.70% 14.10%
Origination Year 2011 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 5,259 7,029
% of Total Home Loans 14.30% 15.90%
Origination Year 2012 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,831 3,325
% of Total Home Loans 7.70% 7.60%
Origination Year 2013 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 580  
% of Total Home Loans 1.60%  
1st Lien [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 35,295 42,407
% of Total Home Loans 95.80% 96.20%
2nd Lien [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,522 1,693
% of Total Home Loans 4.20% 3.80%
Fixed Rate [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 6,020 6,571
% of Total Home Loans 16.30% 14.90%
Adjustable Rate [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 30,797 37,529
% of Total Home Loans 83.70% 85.10%
California [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 8,535 10,266
% of Total Home Loans 23.20% 23.30%
New York [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,861 3,276
% of Total Home Loans 7.80% 7.40%
Illinois [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,400 2,977
% of Total Home Loans 6.50% 6.70%
Maryland [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,981 2,281
% of Total Home Loans 5.40% 5.20%
New Jersey [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,826 2,119
% of Total Home Loans 5.00% 4.80%
Virginia [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,785 2,090
% of Total Home Loans 4.80% 4.80%
Florida [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,725 2,046
% of Total Home Loans 4.70% 4.60%
Arizona [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,598 1,923
% of Total Home Loans 4.30% 4.30%
Washington [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,477 1,879
% of Total Home Loans 4.00% 4.30%
Louisiana [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,357  
% of Total Home Loans 3.70%  
Other [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 11,272 13,523
% of Total Home Loans 30.60% 30.70%
Colorado [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans   1,720
% of Total Home Loans   3.90%
Non-PCI Loans [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 7,173 7,697
% of Total Home Loans 19.50% 17.50%
Non-PCI Loans [Member] | Origination Year 2005 or Before [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,984 3,483
% of Total Home Loans 8.10% 7.90%
Non-PCI Loans [Member] | Origination Year 2006 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 546 621
% of Total Home Loans 1.50% 1.40%
Non-PCI Loans [Member] | Origination Year 2007 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 387 446
% of Total Home Loans 1.00% 1.00%
Non-PCI Loans [Member] | Origination Year 2008 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 219 257
% of Total Home Loans 0.60% 0.60%
Non-PCI Loans [Member] | Origination Year 2009 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 135 167
% of Total Home Loans 0.40% 0.40%
Non-PCI Loans [Member] | Origination Year 2010 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 149 188
% of Total Home Loans 0.40% 0.40%
Non-PCI Loans [Member] | Origination Year 2011 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 269 324
% of Total Home Loans 0.70% 0.70%
Non-PCI Loans [Member] | Origination Year 2012 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,982 2,211
% of Total Home Loans 5.40% 5.10%
Non-PCI Loans [Member] | Origination Year 2013 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 502  
% of Total Home Loans 1.40%  
Non-PCI Loans [Member] | 1st Lien [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 6,085 6,502
% of Total Home Loans 16.50% 14.80%
Non-PCI Loans [Member] | 2nd Lien [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,088 1,195
% of Total Home Loans 3.00% 2.70%
Non-PCI Loans [Member] | Fixed Rate [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,438 2,534
% of Total Home Loans 6.60% 5.80%
Non-PCI Loans [Member] | Adjustable Rate [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,735 5,163
% of Total Home Loans 12.90% 11.70%
Non-PCI Loans [Member] | California [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,032 1,168
% of Total Home Loans 2.80% 2.70%
Non-PCI Loans [Member] | New York [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,539 1,678
% of Total Home Loans 4.20% 3.80%
Non-PCI Loans [Member] | Illinois [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 89 102
% of Total Home Loans 0.20% 0.20%
Non-PCI Loans [Member] | Maryland [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 413 403
% of Total Home Loans 1.10% 0.90%
Non-PCI Loans [Member] | New Jersey [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 366 402
% of Total Home Loans 1.00% 0.90%
Non-PCI Loans [Member] | Virginia [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 340 342
% of Total Home Loans 0.90% 0.80%
Non-PCI Loans [Member] | Florida [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 172 183
% of Total Home Loans 0.50% 0.40%
Non-PCI Loans [Member] | Arizona [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 92 95
% of Total Home Loans 0.20% 0.20%
Non-PCI Loans [Member] | Washington [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 103 113
% of Total Home Loans 0.30% 0.30%
Non-PCI Loans [Member] | Louisiana [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,307  
% of Total Home Loans 3.60%  
Non-PCI Loans [Member] | Other [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,720 3,085
% of Total Home Loans 4.70% 7.00%
Non-PCI Loans [Member] | Colorado [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans   126
% of Total Home Loans   0.30%
PCI Loans [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 29,644 36,403
% of Total Home Loans 80.50% 82.50%
PCI Loans [Member] | Origination Year 2005 or Before [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,203 4,858
% of Total Home Loans 11.40% 11.00%
PCI Loans [Member] | Origination Year 2006 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,555 2,865
% of Total Home Loans 6.90% 6.50%
PCI Loans [Member] | Origination Year 2007 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 5,451 6,189
% of Total Home Loans 14.80% 14.00%
PCI Loans [Member] | Origination Year 2008 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,311 5,210
% of Total Home Loans 11.70% 11.80%
PCI Loans [Member] | Origination Year 2009 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,697 3,438
% of Total Home Loans 7.30% 7.80%
PCI Loans [Member] | Origination Year 2010 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,510 6,024
% of Total Home Loans 12.30% 13.70%
PCI Loans [Member] | Origination Year 2011 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 4,990 6,705
% of Total Home Loans 13.60% 15.20%
PCI Loans [Member] | Origination Year 2012 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 849 1,114
% of Total Home Loans 2.30% 2.50%
PCI Loans [Member] | Origination Year 2013 [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 78  
% of Total Home Loans 0.20%  
PCI Loans [Member] | 1st Lien [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 29,210 35,905
% of Total Home Loans 79.30% 81.40%
PCI Loans [Member] | 2nd Lien [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 434 498
% of Total Home Loans 1.20% 1.10%
PCI Loans [Member] | Fixed Rate [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 3,582 4,037
% of Total Home Loans 9.70% 9.10%
PCI Loans [Member] | Adjustable Rate [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 26,062 32,366
% of Total Home Loans 70.80% 73.40%
PCI Loans [Member] | California [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 7,503 9,098
% of Total Home Loans 20.40% 20.60%
PCI Loans [Member] | New York [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,322 1,598
% of Total Home Loans 3.60% 3.60%
PCI Loans [Member] | Illinois [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 2,311 2,875
% of Total Home Loans 6.30% 6.50%
PCI Loans [Member] | Maryland [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,568 1,878
% of Total Home Loans 4.30% 4.30%
PCI Loans [Member] | New Jersey [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,460 1,717
% of Total Home Loans 4.00% 3.90%
PCI Loans [Member] | Virginia [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,445 1,748
% of Total Home Loans 3.90% 4.00%
PCI Loans [Member] | Florida [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,553 1,863
% of Total Home Loans 4.20% 4.20%
PCI Loans [Member] | Arizona [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,506 1,828
% of Total Home Loans 4.10% 4.10%
PCI Loans [Member] | Washington [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 1,374 1,766
% of Total Home Loans 3.70% 4.00%
PCI Loans [Member] | Louisiana [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 50  
% of Total Home Loans 0.10%  
PCI Loans [Member] | Other [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans 9,552 10,438
% of Total Home Loans 25.90% 23.70%
PCI Loans [Member] | Colorado [Member]
    
Home Loans Risk Profile [Line Items]    
Mortgage loans   $ 1,594
% of Total Home Loans   3.60%