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 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Debt [Member]
Sep. 30, 2011
Debt [Member]
Dec. 31, 2011
Debt [Member]
Dec. 31, 2010
Debt [Member]
Sep. 30, 2012
Taxable Securities [Member]
Dec. 31, 2011
Taxable Securities [Member]
Sep. 30, 2012
United States Treasury And Agency Securities [Member]
Dec. 31, 2011
United States Treasury And Agency Securities [Member]
Sep. 30, 2012
Agency Securities [Member]
Dec. 31, 2011
Agency Securities [Member]
Sep. 30, 2012
Collateralized Mortgage Obligations [Member]
Dec. 31, 2011
Collateralized Mortgage Obligations [Member]
Sep. 30, 2012
Residential Mortgage Backed Securities [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Sep. 30, 2012
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
Sep. 30, 2012
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
Sep. 30, 2012
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
Dec. 31, 2011
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
Sep. 30, 2012
Commercial Mortgage Backed Securities [Member]
Dec. 31, 2011
Commercial Mortgage Backed Securities [Member]
Sep. 30, 2012
Non United States Securities [Member]
Dec. 31, 2011
Non United States Securities [Member]
Sep. 30, 2012
Corporate Bond Securities [Member]
Dec. 31, 2011
Corporate Bond Securities [Member]
Sep. 30, 2012
Other Debt Obligations [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Sep. 30, 2012
Tax-exempt securities [Member]
Dec. 31, 2011
Tax-exempt securities [Member]
Sep. 30, 2012
Equity securities [Member]
Dec. 31, 2011
Equity securities [Member]
Debt and Marketable Equity Securities [Abstract]                                                                          
Available-for-sale Securities, Amortized Cost           $ 296,833   $ 271,172   $ 293,993 $ 266,494 $ 24,794 $ 43,433 $ 196,976 $ 138,073 $ 38,863 $ 44,392 $ 9,772 [1] $ 14,948 [1]             $ 3,733 $ 4,894 $ 5,709 $ 4,872 $ 2,018 $ 2,993 $ 12,128 $ 12,889 $ 2,840 $ 4,678    
Available-for-sale Securities, Gross Unrealized Gains           9,745   6,662   9,728 6,647 236 242 7,091 4,511 1,412 774 377 [1] 301 [1]             394 629 50 62 83 79 85 49 17 15 526 [2] 10 [2]
Available-for-sale Securities, Gross Unrealized Losses           (629)   (1,683)   (579) (1,593) (235) (811) (24) (21) (128) (167) (147) [1] (482) [1]               (1) (11) (14) (18) (37) (16) (60) (50) (90) (5) [2] (7) [2]
AFS Debt Securities 305,949   305,949   276,151 305,949   276,151   303,142 271,548 24,795 42,864 204,043 142,563 40,147 44,999 10,002 [1] 14,767 [1]             4,127 5,522 5,748 4,920 2,083 3,035 12,197 12,878 2,807 4,603    
Held-to-maturity debt securities, Amortized Cost 39,898   39,898   35,265                                                                
Held-to-maturity Securities, Unrecognized Holding Gain 1,230   1,230   181                                                                
Held-to-maturity Securities, Unrecognized Holding Loss         (4)                                                                
Held-to-maturity Securities, Fair Value 41,128   41,128   35,442                                                                
Total Debt Securities Amortized Cost 336,731   336,731   306,437                                                                
Total Debt Securities Gross Unrealized Gains 10,975   10,975   6,843                                                                
Total Debt Securities Gross Unrealized Losses (629)   (629)   (1,687)                                                                
Debt Securities, Fair Value 347,077   347,077   311,593                                                                
Available-for-sale Equity Securities, Amortized Cost Basis                                                                       783 [2] 65 [2]
Available-for-sale Securities, Equity Securities                                                                       1,304 [2] 68 [2]
Table Details [Abstract]                                                                          
Available-for-sale Securities, Debt Maturities, Percent Held by Rating                                       91.00% 89.00% 6.00% 9.00% 3.00% 2.00%                        
In Text Details [Abstract]                                                                          
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 5,700   5,700     5,745 4,285 3,100 714                                                        
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 3,400         2,024 2,860                                                            
Nonperforming Debt Securities 98   98   140                                                                
Gross gains recorded in OCI $ 1 $ 2 $ 4 $ 6                                                                  
[1] At September 30, 2012, includes approximately 91 percent prime, six percent Alt-A, and three percent subprime. At December 31, 2011, includes approximately 89 percent prime, nine percent Alt-A and two percent subprime.
[2] Classified in other assets on the Corporation’s Consolidated Balance Sheet.