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, 2013
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
US Government Corporations and Agencies Securities [Member]
Dec. 31, 2012
US Government Corporations and Agencies Securities [Member]
Sep. 30, 2013
Debt [Member]
Sep. 30, 2012
Debt [Member]
Dec. 31, 2012
Debt [Member]
Dec. 31, 2011
Debt [Member]
Sep. 30, 2013
Taxable Securities [Member]
Dec. 31, 2012
Taxable Securities [Member]
Sep. 30, 2013
Agency Securities [Member]
Dec. 31, 2012
Agency Securities [Member]
Sep. 30, 2013
Collateralized Mortgage Obligations [Member]
Dec. 31, 2012
Collateralized Mortgage Obligations [Member]
Sep. 30, 2013
Residential Mortgage Backed Securities [Member]
Dec. 31, 2012
Residential Mortgage Backed Securities [Member]
Sep. 30, 2013
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
Dec. 31, 2012
Residential Mortgage Backed Securities [Member]
Prime Loan [Member]
Sep. 30, 2013
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
Dec. 31, 2012
Residential Mortgage Backed Securities [Member]
Alt-A Loan [Member]
Sep. 30, 2013
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
Dec. 31, 2012
Residential Mortgage Backed Securities [Member]
Subprime Loan [Member]
Sep. 30, 2013
Commercial Mortgage Backed Securities [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Sep. 30, 2013
Non United States Securities [Member]
Dec. 31, 2012
Non United States Securities [Member]
Sep. 30, 2013
Corporate Bond Securities [Member]
Dec. 31, 2012
Corporate Bond Securities [Member]
Sep. 30, 2013
Other Debt Obligations [Member]
Dec. 31, 2012
Other Debt Obligations [Member]
Sep. 30, 2013
Tax-exempt securities [Member]
Dec. 31, 2012
Tax-exempt securities [Member]
Sep. 30, 2013
Equity securities [Member]
Dec. 31, 2012
Equity securities [Member]
Debt and Marketable Equity Securities [Abstract]                                                                      
Available-for-sale Securities, Amortized Cost       $ 2,872 $ 24,232 $ 236,284   $ 279,860   $ 231,020 $ 275,693 $ 170,911 $ 183,247 $ 27,187 $ 36,329 $ 6,788 [1] $ 9,231 [2]             $ 2,751 $ 3,576 $ 6,217 $ 5,574 $ 1,152 $ 1,415 $ 13,142 $ 12,089 $ 5,264 $ 4,167    
Available-for-sale Securities, Gross Unrealized Gains       127 324 2,199   7,706   2,193 7,693 1,311 5,048 340 1,427 239 [1] 391 [2]             84 348 35 50 28 51 29 54 6 13 0 [3] 732 [4]
Available-for-sale Securities, Gross Unrealized Losses       (28) (84) (3,587)   (660)   (3,551) (613) (3,197) (146) (192) (218) (98) [1] (128) [2]             (8) 0 (12) (6) (10) (16) (6) (15) (36) (47) (5) [3] 0 [4]
AFS Debt Securities       2,971 24,472 234,896   286,906   229,662 282,773 169,025 188,149 27,335 37,538 6,929 [1] 9,494 [2]             2,827 3,924 6,240 5,618 1,170 1,450 13,165 12,128 5,234 4,133    
Other Debt Securities Carried at Fair Value, Amortized Cost 32,365 32,365 23,927                                                                
Other Debt Securities Carried at Fair Value, Gross Unrealized Gain 98 98 120                                                                
Other Debt Securities Carried at Fair Value, Gross Unrealized Loss (1,010) (1,010) (103)                                                                
Other Debt Securities Carried at Fair Value 31,453 31,453 23,944 0 491             18,626 13,073 563 929                 758 0 11,506 [5] 9,451 [5]                
Debt Securities Carried at Fair Value, Amortized Cost 268,649 268,649 303,787                                                                
Debt Securities Carried at Fair Value, Gross Unrealized Gain 2,297 2,297 7,826                                                                
Debt Securities Carried at Fair Value, Gross Unrealized Loss (4,597) (4,597) (763)                                                                
Debt Securities Carried at Fair Value 266,349 266,349 310,850 2,971           261,115   187,651   27,898   6,929               3,585       1,170   13,165   5,234      
Held-to-maturity debt securities, Amortized Cost 54,649 [6] 54,649 [6] 49,481                                                                
Held-to-maturity Securities, Unrecognized Holding Gain 67 67 815                                                                
Held-to-maturity Securities, Unrecognized Holding Loss (1,865) (1,865) (26)                                                                
Held-to-maturity Securities, Fair Value 52,851 [6] 52,851 [6] 50,270                                                                
Total Debt Securities Amortized Cost 323,298 323,298 353,268                                                                
Total Debt Securities Gross Unrealized Gains 2,364 2,364 8,641                                                                
Total Debt Securities Gross Unrealized Losses (6,462) (6,462) (789)                                                                
Debt Securities, Fair Value 319,200 319,200 361,120                                                                
Available-for-sale Equity Securities, Amortized Cost Basis                                                                   119 [3] 780 [4]
Available-for-sale Securities, Equity Securities                                                                   114 [3] 1,512 [4]
Table Details [Abstract]                                                                      
Available-for-sale Securities, Debt Maturities, Percent Held by Rating                                   89.00% 91.00% 7.00% 6.00% 4.00% 3.00%                        
In Text Details [Abstract]                                                                      
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (860) (860)         5,745 4,443 3,100                                                    
Net change in fair value of accumulated OCI, tax effect, Securities (528)         (2,813) 2,024                                                        
Nonperforming Debt Securities 97 97 91                                                                
Other Debt Securities Carried at Fair Value, Gains (Losses) $ (56) $ (1,600)                                                                  
[1] At September 30, 2013, the underlying collateral type included approximately 89 percent prime, seven percent Alt-A and four percent subprime.
[2] At December 31, 2012, the underlying collateral type included approximately 91 percent prime, six percent Alt-A and three percent subprime.
[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
[4] Classified in other assets on the Consolidated Balance Sheet.
[5] These securities are used to satisfy certain international regulatory liquidity requirements.
[6] Substantially all U.S. agency MBS.