Quarterly report pursuant to Section 13 or 15(d)

Securities - Amortized Cost, Gains and Losses, and Fair Value (Details)

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Securities - Amortized Cost, Gains and Losses, and Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Debt and Marketable Equity Securities [Abstract]        
Other Debt Securities Carried at Fair Value, Amortized Cost $ 43,442   $ 23,927  
Other Debt Securities Carried at Fair Value, Gross Unrealized Gain 129   120  
Other Debt Securities Carried at Fair Value, Gross Unrealized Loss (289)   (103)  
Other Debt Securities Carried at Fair Value 43,282   23,944  
Debt Securities Carried at Fair Value, Amortized Cost 299,749   303,787  
Debt Securities Carried at Fair Value, Gross Unrealized Gain 6,764   7,826  
Debt Securities Carried at Fair Value, Gross Unrealized Loss (1,381)   (763)  
Debt Securities Carried at Fair Value 305,132   310,850  
Held-to-maturity debt securities, Amortized Cost 49,577   49,481  
Held-to-maturity Securities, Unrecognized Holding Gain 446   815  
Held-to-maturity Securities, Unrecognized Holding Loss (249)   (26)  
Held-to-maturity Securities, Fair Value 49,774   50,270  
Total Debt Securities Amortized Cost 349,326   353,268  
Total Debt Securities Gross Unrealized Gains 7,210   8,641  
Total Debt Securities Gross Unrealized Losses (1,630)   (789)  
Debt Securities, Fair Value 354,906   361,120  
In Text Details [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 3,500      
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 2,000      
Nonperforming Debt Securities 90   91  
US Government Corporations and Agencies Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 17,186   24,232  
Available-for-sale Securities, Gross Unrealized Gains 315   324  
Available-for-sale Securities, Gross Unrealized Losses (62)   (84)  
AFS Debt Securities 17,439   24,472  
Other Debt Securities Carried at Fair Value 3,861   491  
Debt Securities Carried at Fair Value 21,300      
Debt [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 256,307   279,860  
Available-for-sale Securities, Gross Unrealized Gains 6,635   7,706  
Available-for-sale Securities, Gross Unrealized Losses (1,092)   (660)  
AFS Debt Securities 261,850   286,906  
In Text Details [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 3,497 2,162 4,443 3,100
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 535 291    
Taxable Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 251,700   275,693  
Available-for-sale Securities, Gross Unrealized Gains 6,618   7,693  
Available-for-sale Securities, Gross Unrealized Losses (1,050)   (613)  
AFS Debt Securities 257,268   282,773  
Debt Securities Carried at Fair Value 300,550      
Agency Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 170,842   183,247  
Available-for-sale Securities, Gross Unrealized Gains 4,050   5,048  
Available-for-sale Securities, Gross Unrealized Losses (624)   (146)  
AFS Debt Securities 174,268   188,149  
Other Debt Securities Carried at Fair Value 29,178   13,073  
Debt Securities Carried at Fair Value 203,446      
Collateralized Mortgage Obligations [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 33,573   36,329  
Available-for-sale Securities, Gross Unrealized Gains 1,405   1,427  
Available-for-sale Securities, Gross Unrealized Losses (217)   (218)  
AFS Debt Securities 34,761   37,538  
Other Debt Securities Carried at Fair Value 958   929  
Debt Securities Carried at Fair Value 35,719      
Residential Mortgage Backed Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 8,591 [1]   9,231 [1]  
Available-for-sale Securities, Gross Unrealized Gains 402 [1]   391 [1]  
Available-for-sale Securities, Gross Unrealized Losses (116) [1]   (128) [1]  
AFS Debt Securities 8,877 [1]   9,494 [1]  
Debt Securities Carried at Fair Value 8,877      
Residential Mortgage Backed Securities [Member] | Prime Loan [Member]
        
Table Details [Abstract]        
Available-for-sale Securities, Debt Maturities, Percent Held by Rating 91.00%   91.00%  
Residential Mortgage Backed Securities [Member] | Alt-A Loan [Member]
        
Table Details [Abstract]        
Available-for-sale Securities, Debt Maturities, Percent Held by Rating 6.00%   6.00%  
Residential Mortgage Backed Securities [Member] | Subprime Loan [Member]
        
Table Details [Abstract]        
Available-for-sale Securities, Debt Maturities, Percent Held by Rating 3.00%   3.00%  
Commercial Mortgage Backed Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 3,539   3,576  
Available-for-sale Securities, Gross Unrealized Gains 295   348  
Available-for-sale Securities, Gross Unrealized Losses     0  
AFS Debt Securities 3,834   3,924  
Other Debt Securities Carried at Fair Value 103   0  
Debt Securities Carried at Fair Value 3,937      
Non United States Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 5,606   5,574  
Available-for-sale Securities, Gross Unrealized Gains 52   50  
Available-for-sale Securities, Gross Unrealized Losses (8)   (6)  
AFS Debt Securities 5,650   5,618  
Other Debt Securities Carried at Fair Value 9,182 [2]   9,451 [2]  
Corporate Bond Securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 1,349   1,415  
Available-for-sale Securities, Gross Unrealized Gains 47   51  
Available-for-sale Securities, Gross Unrealized Losses (11)   (16)  
AFS Debt Securities 1,385   1,450  
Debt Securities Carried at Fair Value 1,385      
Other Debt Obligations [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 11,014   12,089  
Available-for-sale Securities, Gross Unrealized Gains 52   54  
Available-for-sale Securities, Gross Unrealized Losses (12)   (15)  
AFS Debt Securities 11,054   12,128  
Debt Securities Carried at Fair Value 11,054      
Tax-exempt securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 4,607   4,167  
Available-for-sale Securities, Gross Unrealized Gains 17   13  
Available-for-sale Securities, Gross Unrealized Losses (42)   (47)  
AFS Debt Securities 4,582   4,133  
Debt Securities Carried at Fair Value 4,582      
Equity securities [Member]
        
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Gross Unrealized Gains 795 [3]   732 [3]  
Available-for-sale Securities, Gross Unrealized Losses 0 [3]   0 [3]  
Available-for-sale Equity Securities, Amortized Cost Basis 769 [3]   780 [3]  
Available-for-sale Securities, Equity Securities $ 1,564 [3]   $ 1,512 [3]  
[1] At March 31, 2013, the underlying collateral type includes approximately 91 percent prime, six percent Alt-A and three percent subprime.
[2] These securities are used to satisfy certain international regulatory liquidity requirements.
[3] Classified in other assets on the Consolidated Balance Sheet.Debt Securities and Available-for-Sale Marketable Equity Securities December 31, 2012(Dollars in millions)AmortizedCost GrossUnrealizedGains GrossUnrealizedLosses Fair ValueAvailable-for-sale debt securities U.S. Treasury and agency securities$24,232 $324 $(84) $24,472Mortgage-backed securities: Agency183,247 5,048 (146) 188,149Agency-collateralized mortgage obligations36,329 1,427 (218) 37,538Non-agency residential (1)9,231 391 (128) 9,494Non-agency commercial3,576 348 — 3,924Non-U.S. securities5,574 50 (6) 5,618Corporate/Agency bonds1,415 51 (16) 1,450Other taxable securities, substantially all asset-backed securities12,089 54 (15) 12,128Total taxable securities275,693 7,693 (613) 282,773Tax-exempt securities4,167 13 (47) 4,133Total available-for-sale debt securities279,860 7,706 (660) 286,906Other debt securities carried at fair value23,927 120 (103) 23,944Total debt securities carried at fair value303,787 7,826 (763) 310,850Held-to-maturity debt securities, substantially all U.S. agency mortgage-backed securities49,481 815 (26) 50,270Total debt securities$353,268 $8,641 $(789) $361,120Available-for-sale marketable equity securities (2)$780 $732 $— $1,512