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Investment Securities (Schedule of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost $ 100,065 $ 108,563
Available for sale, gross unrealized gains 1,308 2,001
Available for sale, gross unrealized losses 1,193 882
Available for sale, fair value 100,180 109,682
Held to maturity, amortized cost 15,468 11,379
Held to maturity, gross unrealized gains 352 373
Held to maturity, gross unrealized losses 438 91
Held to maturity, fair value 15,382 11,661
Total asset-backed securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 30,333 32,897
Available for sale, gross unrealized gains 254 320
Available for sale, gross unrealized losses 594 734
Available for sale, fair value 29,993 32,483
Held to maturity, amortized cost 2,251 16
Held to maturity, gross unrealized gains 1 0
Held to maturity, gross unrealized losses 16 0
Held to maturity, fair value 2,236 16
US Treasury and federal agencies, direct obligations
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 758 823
Available for sale, gross unrealized gains 20 19
Available for sale, gross unrealized losses 1 1
Available for sale, fair value 777 841
Held to maturity, amortized cost 5,000 5,000
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 302 8
Held to maturity, fair value 4,698 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 26,416 31,640
Available for sale, gross unrealized gains 303 598
Available for sale, gross unrealized losses 257 26
Available for sale, fair value 26,462 32,212
Held to maturity, amortized cost 114 153
Held to maturity, gross unrealized gains 8 11
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 122 164
Asset-backed securities, student loans
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 15,476 [1] 16,829 [1]
Available for sale, gross unrealized gains 60 [1] 100 [1]
Available for sale, gross unrealized losses 396 [1] 508 [1]
Available for sale, fair value 15,140 [1] 16,421 [1]
Held to maturity, amortized cost 1,294 [1] 0 [1]
Held to maturity, gross unrealized gains 0 [1] 0 [1]
Held to maturity, gross unrealized losses 14 [1] 0 [1]
Held to maturity, fair value 1,280 [1] 0 [1]
Asset-backed securities, credit cards
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 9,159 9,928
Available for sale, gross unrealized gains 24 61
Available for sale, gross unrealized losses 49 3
Available for sale, fair value 9,134 9,986
Held to maturity, amortized cost 68 0
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 1 0
Held to maturity, fair value 67 0
Asset-backed securities, sub-prime
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 1,434 1,557
Available for sale, gross unrealized gains 4 4
Available for sale, gross unrealized losses 113 162
Available for sale, fair value 1,325 1,399
Asset-backed securities, other
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,264 4,583
Available for sale, gross unrealized gains 166 155
Available for sale, gross unrealized losses 36 61
Available for sale, fair value 4,394 4,677
Held to maturity, amortized cost 889 16
Held to maturity, gross unrealized gains 1 0
Held to maturity, gross unrealized losses 1 0
Held to maturity, fair value 889 16
Total non-U.S. debt securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 23,291 24,717
Available for sale, gross unrealized gains 342 443
Available for sale, gross unrealized losses 37 32
Available for sale, fair value 23,596 25,128
Held to maturity, amortized cost 5,175 3,726
Held to maturity, gross unrealized gains 140 101
Held to maturity, gross unrealized losses 78 71
Held to maturity, fair value 5,237 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 10,153 11,119
Available for sale, gross unrealized gains 251 313
Available for sale, gross unrealized losses 13 27
Available for sale, fair value 10,391 11,405
Held to maturity, amortized cost 3,809 3,122
Held to maturity, gross unrealized gains 121 85
Held to maturity, gross unrealized losses 76 68
Held to maturity, fair value 3,854 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 5,438 6,180
Available for sale, gross unrealized gains 32 42
Available for sale, gross unrealized losses 3 4
Available for sale, fair value 5,467 6,218
Held to maturity, amortized cost 1,167 434
Held to maturity, gross unrealized gains 19 16
Held to maturity, gross unrealized losses 2 1
Held to maturity, fair value 1,184 449
Non-US debt securities, government securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 3,431 3,197
Available for sale, gross unrealized gains 1 2
Available for sale, gross unrealized losses 2 0
Available for sale, fair value 3,430 3,199
Held to maturity, amortized cost 15 3
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 15 3
Non-U.S. debt securities, other
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,269 4,221
Available for sale, gross unrealized gains 58 86
Available for sale, gross unrealized losses 19 1
Available for sale, fair value 4,308 4,306
Held to maturity, amortized cost 184 167
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 0 2
Held to maturity, fair value 184 165
State and political subdivisions
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 8,157 7,384
Available for sale, gross unrealized gains 148 234
Available for sale, gross unrealized losses 186 67
Available for sale, fair value 8,119 7,551
Held to maturity, amortized cost 66 74
Held to maturity, gross unrealized gains 1 2
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 67 76
Collateralized mortgage obligations
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,969 4,818
Available for sale, gross unrealized gains 87 151
Available for sale, gross unrealized losses 80 15
Available for sale, fair value 4,976 4,954
Held to maturity, amortized cost 2,862 2,410
Held to maturity, gross unrealized gains 202 259
Held to maturity, gross unrealized losses 42 12
Held to maturity, fair value 3,022 2,657
Other U.S.debt securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,955 5,072
Available for sale, gross unrealized gains 148 233
Available for sale, gross unrealized losses 38 7
Available for sale, fair value 5,065 5,298
U.S. equity securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 37 28
Available for sale, gross unrealized gains 6 3
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 43 31
Non-U.S. equity securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 1 1
Available for sale, gross unrealized gains 0 0
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 1 1
Money-market mutual funds
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 1,148 1,183
Available for sale, gross unrealized gains 0 0
Available for sale, gross unrealized losses 0 0
Available for sale, fair value $ 1,148 $ 1,183
[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.