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Investment Securities (Schedule Of Marketable Securities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost $ 102,549 $ 108,563
Available for sale, gross unrealized gains 1,918 2,001
Available for sale, gross unrealized losses 631 882
Available for sale, fair value 103,836 109,682
Held to maturity, amortized cost 13,593 11,379
Held to maturity, gross unrealized gains 398 373
Held to maturity, gross unrealized losses 122 91
Held to maturity, fair value 13,869 11,661
Total asset-backed securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 31,304 32,897
Available for sale, gross unrealized gains 339 320
Available for sale, gross unrealized losses 464 734
Available for sale, fair value 31,179 32,483
Held to maturity, amortized cost 1,258 16
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 1 0
Held to maturity, fair value 1,257 16
US Treasury and federal agencies, direct obligations
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 787 823
Available for sale, gross unrealized gains 18 19
Available for sale, gross unrealized losses 1 1
Available for sale, fair value 804 841
Held to maturity, amortized cost 5,000 5,000
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 37 8
Held to maturity, fair value 4,963 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 28,244 31,640
Available for sale, gross unrealized gains 544 598
Available for sale, gross unrealized losses 43 26
Available for sale, fair value 28,745 32,212
Held to maturity, amortized cost 131 153
Held to maturity, gross unrealized gains 10 11
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 141 164
Asset-backed securities, student loans
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 15,846 [1] 16,829 [1]
Available for sale, gross unrealized gains 125 [1] 100 [1]
Available for sale, gross unrealized losses 305 [1] 508 [1]
Available for sale, fair value 15,666 [1] 16,421 [1]
Held to maturity, amortized cost 511 [1] 0 [1]
Held to maturity, gross unrealized gains 0 [1] 0 [1]
Held to maturity, gross unrealized losses 0 [1] 0 [1]
Held to maturity, fair value 511 [1] 0 [1]
Asset-backed securities, credit cards
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 9,624 9,928
Available for sale, gross unrealized gains 48 61
Available for sale, gross unrealized losses 4 3
Available for sale, fair value 9,668 9,986
Held to maturity, amortized cost 25 0
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 25 0
Asset-backed securities, sub-prime
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 1,495 1,557
Available for sale, gross unrealized gains 5 4
Available for sale, gross unrealized losses 115 162
Available for sale, fair value 1,385 1,399
Asset-backed securities, other
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,339 4,583
Available for sale, gross unrealized gains 161 155
Available for sale, gross unrealized losses 40 61
Available for sale, fair value 4,460 4,677
Held to maturity, amortized cost 722 16
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 1 0
Held to maturity, fair value 721 16
Total non-U.S. debt securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 23,573 24,717
Available for sale, gross unrealized gains 430 443
Available for sale, gross unrealized losses 28 32
Available for sale, fair value 23,975 25,128
Held to maturity, amortized cost 4,615 3,726
Held to maturity, gross unrealized gains 140 101
Held to maturity, gross unrealized losses 66 71
Held to maturity, fair value 4,689 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 10,611 11,119
Available for sale, gross unrealized gains 306 313
Available for sale, gross unrealized losses 22 27
Available for sale, fair value 10,895 11,405
Held to maturity, amortized cost 3,617 3,122
Held to maturity, gross unrealized gains 121 85
Held to maturity, gross unrealized losses 64 68
Held to maturity, fair value 3,674 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 5,711 6,180
Available for sale, gross unrealized gains 40 42
Available for sale, gross unrealized losses 3 4
Available for sale, fair value 5,748 6,218
Held to maturity, amortized cost 822 434
Held to maturity, gross unrealized gains 19 16
Held to maturity, gross unrealized losses 1 1
Held to maturity, fair value 840 449
Non-US debt securities, government securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 2,957 3,197
Available for sale, gross unrealized gains 4 2
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 2,961 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 4,294 4,221
Available for sale, gross unrealized gains 80 86
Available for sale, gross unrealized losses 3 1
Available for sale, fair value 4,371 4,306
Held to maturity, amortized cost 161 167
Held to maturity, gross unrealized gains 0 0
Held to maturity, gross unrealized losses 1 2
Held to maturity, fair value 160 165
State and political subdivisions
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 7,447 7,384
Available for sale, gross unrealized gains 222 234
Available for sale, gross unrealized losses 69 67
Available for sale, fair value 7,600 7,551
Held to maturity, amortized cost 70 74
Held to maturity, gross unrealized gains 1 2
Held to maturity, gross unrealized losses 0 0
Held to maturity, fair value 71 76
Collateralized mortgage obligations
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 4,714 4,818
Available for sale, gross unrealized gains 133 151
Available for sale, gross unrealized losses 19 15
Available for sale, fair value 4,828 4,954
Held to maturity, amortized cost 2,519 2,410
Held to maturity, gross unrealized gains 247 259
Held to maturity, gross unrealized losses 18 12
Held to maturity, fair value 2,748 2,657
Other U.S.debt securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 5,087 5,072
Available for sale, gross unrealized gains 227 233
Available for sale, gross unrealized losses 7 7
Available for sale, fair value 5,307 5,298
U.S. equity securities
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 133 109
Available for sale, gross unrealized gains 5 3
Available for sale, gross unrealized losses 0 0
Available for sale, fair value 138 112
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
Money-market mutual funds
   
Available-For-Sale and Held-To-Maturity-Securities [Line Items]    
Available for sale, amortized cost 1,258 1,102
Available for sale, gross unrealized gains 0 0
Available for sale, gross unrealized losses 0 0
Available for sale, fair value $ 1,258 $ 1,102
[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.