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Investment Securities (Schedule of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost $ 99,747 $ 108,563
Available for sale, gross unrealized gains 1,292 2,001
Available for sale, gross unrealized losses 1,057 882
Available for sale, fair value 99,982 109,682
Held to maturity, amortized cost 16,698 11,379
Held to maturity, gross unrealized gains 349 373
Held to maturity, gross unrealized losses 504 91
Held to maturity, fair value 16,543 11,661
Total asset-backed securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 29,871 32,897
Available for sale, gross unrealized gains 270 320
Available for sale, gross unrealized losses 477 734
Available for sale, fair value 29,664 32,483
Held to maturity, amortized cost 2,851 16
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 14 0
Held to maturity, fair value 2,837 16
US Treasury and federal agencies, direct obligations
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 729 823
Available for sale, gross unrealized gains 11 19
Available for sale, gross unrealized losses 2 1
Available for sale, fair value 738 841
Held to maturity, amortized cost 5,003 5,000
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 390 8
Held to maturity, fair value 4,613 4,992
US Treasury and federal agencies, mortgage-backed securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 24,562 31,640
Available for sale, gross unrealized gains 275 598
Available for sale, gross unrealized losses 262 26
Available for sale, fair value 24,575 32,212
Held to maturity, amortized cost 100 153
Held to maturity, gross unrealized gains 7 11
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 107 164
Asset-backed securities, student loans
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 15,079 [1] 16,829 [1]
Available for sale, gross unrealized gains 94 [1] 100 [1]
Available for sale, gross unrealized losses 302 [1] 508 [1]
Available for sale, fair value 14,871 [1] 16,421 [1]
Held to maturity, amortized cost 1,502 [1] 0 [1]
Held to maturity, gross unrealized gains 0 [1] 0 [1]
Held to maturity, gross unrealized losses 11 [1] 0 [1]
Held to maturity, fair value 1,491 [1] 0 [1]
Asset-backed securities, credit cards
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 8,649 9,928
Available for sale, gross unrealized gains 23 61
Available for sale, gross unrealized losses 46 3
Available for sale, fair value 8,626 9,986
Held to maturity, amortized cost 531 0
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 531 0
Asset-backed securities, sub-prime
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 1,371 1,557
Available for sale, gross unrealized gains 5 4
Available for sale, gross unrealized losses 110 162
Available for sale, fair value 1,266 1,399
Asset-backed securities, other
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,772 4,583
Available for sale, gross unrealized gains 148 155
Available for sale, gross unrealized losses 19 61
Available for sale, fair value 4,901 4,677
Held to maturity, amortized cost 818 16
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 3 0
Held to maturity, fair value 815 16
Total non-U.S. debt securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 24,311 24,717
Available for sale, gross unrealized gains 328 443
Available for sale, gross unrealized losses 30 32
Available for sale, fair value 24,609 25,128
Held to maturity, amortized cost 5,801 3,726
Held to maturity, gross unrealized gains 148 101
Held to maturity, gross unrealized losses 69 71
Held to maturity, fair value 5,880 3,756
Non-U.S. debt securities, mortgage-backed securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 10,773 11,119
Available for sale, gross unrealized gains 241 313
Available for sale, gross unrealized losses 13 27
Available for sale, fair value 11,001 11,405
Held to maturity, amortized cost 4,109 3,122
Held to maturity, gross unrealized gains 130 85
Held to maturity, gross unrealized losses 67 68
Held to maturity, fair value 4,172 3,139
Non-U.S. debt securities, asset-backed securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 5,445 6,180
Available for sale, gross unrealized gains 25 42
Available for sale, gross unrealized losses 3 4
Available for sale, fair value 5,467 6,218
Held to maturity, amortized cost 1,486 434
Held to maturity, gross unrealized gains 18 16
Held to maturity, gross unrealized losses 2 1
Held to maturity, fair value 1,502 449
Non-US debt securities, government securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 3,537 3,197
Available for sale, gross unrealized gains 4 2
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 3,541 3,199
Held to maturity, amortized cost 16 3
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 16 3
Non-U.S. debt securities, other
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,556 4,221
Available for sale, gross unrealized gains 58 86
Available for sale, gross unrealized losses 14 1
Available for sale, fair value 4,600 4,306
Held to maturity, amortized cost 190 167
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 0 2
Held to maturity, fair value 190 165
State and political subdivisions
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 9,307 7,384
Available for sale, gross unrealized gains 171 234
Available for sale, gross unrealized losses 180 67
Available for sale, fair value 9,298 7,551
Held to maturity, amortized cost 61 74
Held to maturity, gross unrealized gains 1 2
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 62 76
Collateralized mortgage obligations
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 5,152 4,818
Available for sale, gross unrealized gains 79 151
Available for sale, gross unrealized losses 73 15
Available for sale, fair value 5,158 4,954
Held to maturity, amortized cost 2,882 2,410
Held to maturity, gross unrealized gains 193 259
Held to maturity, gross unrealized losses 31 12
Held to maturity, fair value 3,044 2,657
Other U.S.debt securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,925 5,072
Available for sale, gross unrealized gains 153 233
Available for sale, gross unrealized losses 33 7
Available for sale, fair value 5,045 5,298
U.S. equity securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 34 28
Available for sale, gross unrealized gains 5 3
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 39 31
Non-U.S. equity securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 2 1
Available for sale, gross unrealized gains 0 0
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 2 1
U.S. money-market mutual funds
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 680 1,062
Available for sale, gross unrealized gains 0 0
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 680 1,062
Non-U.S. money-market mutual funds
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 174 121
Available for sale, gross unrealized gains 0 0
Available for sale, gross unrealized losses 0 0
Available for sale, fair value $ 174 $ 121
[1] Substantially composed of securities guaranteed by the federal government with respect to at least 97% of defaulted principal and accrued interest on the underlying loans.