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, 2012
Mar. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost     $ 271,172  
AFS Debt Securities 297,040   276,151  
Held-to-maturity debt securities, Amortized Cost 34,205 [1]   35,265  
Held-to-maturity Securities, Unrecognized Holding Gain 246 [1]   181 [1]  
Held-to-maturity Securities, Unrecognized Holding Loss (11) [1]   (4) [1]  
Held-to-maturity Securities, Fair Value 34,440   35,442  
Total Debt Securities Amortized Cost 327,761   306,437  
Total Debt Securities Gross Unrealized Gains 5,554   6,843  
Total Debt Securities Gross Unrealized Losses (1,835)   (1,687)  
Debt Securities, Fair Value 331,480   311,593  
In Text Details [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 2,200      
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 1,300      
Nonperforming Debt Securities 110   140  
Gross gains recorded in OCI 3 10    
Debt [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Gross Unrealized Gains 5,308   6,662  
Available-for-sale Securities, Gross Unrealized Losses (1,824)   (1,683)  
In Text Details [Abstract]        
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 2,162 65 3,100 714
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 291 216    
Taxable Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 289,862   266,494  
Available-for-sale Securities, Gross Unrealized Gains 5,292   6,647  
Available-for-sale Securities, Gross Unrealized Losses (1,767)   (1,593)  
AFS Debt Securities 293,387   271,548  
United States Treasury And Agency Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 40,609   43,433  
Available-for-sale Securities, Gross Unrealized Gains 231   242  
Available-for-sale Securities, Gross Unrealized Losses (874)   (811)  
AFS Debt Securities 39,966   42,864  
Agency Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 172,335   138,073  
Available-for-sale Securities, Gross Unrealized Gains 3,177   4,511  
Available-for-sale Securities, Gross Unrealized Losses (421)   (21)  
AFS Debt Securities 175,091   142,563  
Collateralized Mortgage Obligations [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 41,698   44,392  
Available-for-sale Securities, Gross Unrealized Gains 802   774  
Available-for-sale Securities, Gross Unrealized Losses (145)   (167)  
AFS Debt Securities 42,355   44,999  
Residential Mortgage Backed Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 11,398 [2]   14,948 [2]  
Available-for-sale Securities, Gross Unrealized Gains 300 [2]   301 [2]  
Available-for-sale Securities, Gross Unrealized Losses (228) [2]   (482) [2]  
AFS Debt Securities 11,470 [2]   14,767 [2]  
Residential Mortgage Backed Securities [Member] | Prime Loan [Member]
       
Table Details [Abstract]        
Available-for-sale Securities, Debt Maturities, Percent Held by Rating 92.00%   89.00%  
Residential Mortgage Backed Securities [Member] | Alt-A Loan [Member]
       
Table Details [Abstract]        
Available-for-sale Securities, Debt Maturities, Percent Held by Rating 6.00%   9.00%  
Residential Mortgage Backed Securities [Member] | Subprime Loan [Member]
       
Table Details [Abstract]        
Available-for-sale Securities, Debt Maturities, Percent Held by Rating 2.00%   2.00%  
Commercial Mortgage Backed Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 4,333   4,894  
Available-for-sale Securities, Gross Unrealized Gains 567   629  
Available-for-sale Securities, Gross Unrealized Losses (1)   (1)  
AFS Debt Securities 4,899   5,522  
Non United States Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost     4,872  
Available-for-sale Securities, Gross Unrealized Gains 56   62  
Available-for-sale Securities, Gross Unrealized Losses (18)   (14)  
AFS Debt Securities     4,920  
Corporate Bond Securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 2,364   2,993  
Available-for-sale Securities, Gross Unrealized Gains 85   79  
Available-for-sale Securities, Gross Unrealized Losses (28)   (37)  
AFS Debt Securities 2,421   3,035  
Other Debt Obligations [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 10,595   12,889  
Available-for-sale Securities, Gross Unrealized Gains 74   49  
Available-for-sale Securities, Gross Unrealized Losses (52)   (60)  
AFS Debt Securities 10,617   12,878  
Tax-exempt securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Amortized Cost 3,694   4,678  
Available-for-sale Securities, Gross Unrealized Gains 16   15  
Available-for-sale Securities, Gross Unrealized Losses (57)   (90)  
AFS Debt Securities 3,653   4,603  
Equity securities [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Available-for-sale Securities, Gross Unrealized Gains 28 [3]   10 [3]  
Available-for-sale Securities, Gross Unrealized Losses (5) [3]   (7) [3]  
Available-for-sale Equity Securities, Amortized Cost Basis 64 [3]   65 [3]  
Available-for-sale Securities, Equity Securities 87   68  
Portion at Fair Value, Fair Value Disclosure [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Held-to-maturity debt securities, Amortized Cost 34,440   35,442  
Carrying (Reported) Amount, Fair Value Disclosure [Member]
       
Debt and Marketable Equity Securities [Abstract]        
Held-to-maturity debt securities, Amortized Cost     $ 35,265  
[1] Substantially all U.S. agency mortgage-backed securities.
[2] At March 31, 2012, includes approximately 92 percent prime bonds, six percent Alt-A bonds and two percent subprime bonds. At December 31, 2011, includes approximately 89 percent prime bonds, nine percent Alt-A bonds and two percent subprime bonds.
[3] Classified in other assets on the Corporation’s Consolidated Balance Sheet.