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 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Debt [Member]
Jun. 30, 2011
Debt [Member]
Dec. 31, 2011
Debt [Member]
Dec. 31, 2010
Debt [Member]
Jun. 30, 2012
Taxable Securities [Member]
Dec. 31, 2011
Taxable Securities [Member]
Jun. 30, 2012
United States Treasury And Agency Securities [Member]
Dec. 31, 2011
United States Treasury And Agency Securities [Member]
Jun. 30, 2012
Agency Securities [Member]
Dec. 31, 2011
Agency Securities [Member]
Jun. 30, 2012
Collateralized Mortgage Obligations [Member]
Dec. 31, 2011
Collateralized Mortgage Obligations [Member]
Jun. 30, 2012
Residential Mortgage Backed Securities [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Jun. 30, 2012
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
Jun. 30, 2012
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
Jun. 30, 2012
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
Jun. 30, 2012
Commercial Mortgage Backed Securities [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Jun. 30, 2012
Non United States Securities [Member]
Dec. 31, 2011
Non United States Securities [Member]
Jun. 30, 2012
Corporate Bond Securities [Member]
Dec. 31, 2011
Corporate Bond Securities [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Jun. 30, 2012
Tax-exempt securities [Member]
Dec. 31, 2011
Tax-exempt securities [Member]
Jun. 30, 2012
Equity securities [Member]
Dec. 31, 2011
Equity securities [Member]
Debt and Marketable Equity Securities [Abstract]                                                                          
Available-for-sale Securities, Amortized Cost           $ 294,184   $ 271,172   $ 291,322 $ 266,494 $ 30,034 $ 43,433 $ 189,167 $ 138,073 $ 38,553 $ 44,392 $ 10,514 [1] $ 14,948 [1]             $ 3,751 $ 4,894 $ 5,736 $ 4,872 $ 2,073 $ 2,993 $ 11,494 $ 12,889 $ 2,862 $ 4,678    
Available-for-sale Securities, Gross Unrealized Gains           6,893   6,662   6,876 6,647 237 242 5,075 4,511 752 774 256 [1] 301 [1]             376 629 37 62 75 79 68 49 17 15 27 [2] 10 [2]
Available-for-sale Securities, Gross Unrealized Losses           (1,028)   (1,683)   (976) (1,593) (440) (811) (51) (21) (156) (167) (255) [1] (482) [1]               (1) (8) (14) (26) (37) (40) (60) (52) (90) (6) [2] (7) [2]
AFS Debt Securities 300,049   300,049   276,151 300,049   276,151   297,222 271,548 29,831 42,864 194,191 142,563 39,149 44,999 10,515 [1] 14,767 [1]             4,127 5,522 5,765 4,920 2,122 3,035 11,522 12,878 2,827 4,603    
Held-to-maturity debt securities, Amortized Cost 35,168 [3]   35,168 [3]   35,265 [3]                                                                
Held-to-maturity Securities, Unrecognized Holding Gain 826 [3]   826 [3]   181 [3]                                                                
Held-to-maturity Securities, Unrecognized Holding Loss         (4) [3]                                                                
Held-to-maturity Securities, Fair Value 35,994 [3]   35,994 [3]   35,442 [3]                                                                
Total Debt Securities Amortized Cost 329,352   329,352   306,437                                                                
Total Debt Securities Gross Unrealized Gains 7,719   7,719   6,843                                                                
Total Debt Securities Gross Unrealized Losses (1,028)   (1,028)   (1,687)                                                                
Debt Securities, Fair Value 336,043   336,043   311,593                                                                
Available-for-sale Equity Securities, Amortized Cost Basis                                                                       62 [2] 65 [2]
Available-for-sale Securities, Equity Securities                                                                       83 [2] 68 [2]
Table Details [Abstract]                                                                          
Available-for-sale Securities, Debt Maturities, Percent Held by Rating                                       92.00% 89.00% 6.00% 9.00% 2.00% 2.00%                        
In Text Details [Abstract]                                                                          
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 3,700   3,700     3,693 1,588 3,100 714                                                        
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 2,200         705 1,054                                                            
Nonperforming Debt Securities 109   109   140                                                                
Gross gains recorded in OCI   $ 3 $ 3 $ 10                                                                  
[1] At June 30, 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.
[2] Classified in other assets on the Corporation’s Consolidated Balance Sheet.
[3] Substantially all U.S. agency mortgage-backed securities.