Quarterly report pursuant to Section 13 or 15(d)

Federal Funds Sold or Purchased, Securities Financing Agreements and Short-term Borrowings (Details)

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Federal Funds Sold or Purchased, Securities Financing Agreements and Short-term Borrowings (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings $ 42,148   $ 30,731
Rate at December 31 1.00%   1.29%
Securities Borrowed or Purchased Under Agreements to Resell 220,623   219,324
Securities Loaned or Sold Under Agreements to Repurchase 247,988   292,108
Average Amount During Year 337,644 293,056  
Average Rate During Year 0.90% 1.21%  
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
      
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 220,623   219,924
Rate at December 31 0.53%   0.92%
Average Amount During Year 237,463 233,061  
Average Rate During Year 0.54% 0.79%  
Federal Funds Purchased [Member]
      
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 161   1,151
Rate at December 31 0.05%   0.17%
Average Amount During Year 192 261  
Average Rate During Year 0.05% 0.05%  
Maximum Month-end Balance During Year 176 331  
Securities Sold under Agreements to Repurchase [Member]
      
Short-term Debt [Abstract]      
Rate at December 31 0.77%   1.11%
Average Amount During Year 300,746 256,144  
Average Rate During Year 0.72% 1.10%  
Maximum Month-end Balance During Year 319,608 276,403  
Other Short-term Borrowings [Member]
      
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 42,148   30,731
Rate at December 31 2.59%   3.08%
Average Amount During Year 36,706 36,651  
Average Rate During Year 2.36% 1.99%  
Maximum Month-end Balance During Year 42,148 39,499  
Federal funds sold [Member]
      
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 0   600
Rate at December 31 0.00%   0.54%
Average Amount During Year 2 107  
Average Rate During Year 0.60% 0.73%  
Maximum Month-end Balance During Year 0 102  
Securities borrowed or purchased under agreements to resell [Member]
      
Short-term Debt [Abstract]      
Rate at December 31 0.53%   0.92%
Average Amount During Year 237,461 232,954  
Average Rate During Year 0.54% 0.79%  
Maximum Month-end Balance During Year 249,791 248,267  
Federal Funds Purchased, Securities Loaned or Sold under Agreements to Repurchase and Other Short-term Borrowings [Member]
      
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings $ 290,297   $ 323,990