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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Short-term Debt [Abstract]          
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) $ 45,873   $ 45,873   $ 45,999
Federal funds sold [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 6 13 4 8  
Average Rate During Year (percent) 0.90% 0.65% 0.85% 0.64%  
Maximum Month-end Balance During Year 12 5 12 5  
Securities borrowed or purchased under agreements to resell [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 235,387 233,381 224,008 235,409  
Average Rate During Year (percent) 0.51% 0.55% 0.51% 0.54%  
Maximum Month-end Balance During Year 240,110 240,881 240,110 249,791  
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) 229,449   229,449   190,328
Rate 0.32%   0.32%   0.60%
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 235,393 233,394 224,012 235,417  
Average Rate During Year (percent) 0.51% 0.55% 0.51% 0.54%  
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) 229,449   229,449   190,328
Rate 0.32%   0.32%   0.60%
Federal Funds Purchased [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 166 188 170 191  
Average Rate During Year (percent) 0.05% 0.09% 0.04% 0.07%  
Maximum Month-end Balance During Year 170 195 213 195  
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) 122   122   186
Rate 0.03%   0.03%   0.00%
Securities Loaned or Sold under Agreements to Repurchase [Member]
         
Short-term Debt [Abstract]          
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) 217,707   217,707   197,920
Rate 0.85%   0.85%   0.92%
Securities Sold under Agreements to Repurchase [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 222,358 270,602 213,544 285,590  
Average Rate During Year (percent) 1.10% 0.85% 1.07% 0.78%  
Maximum Month-end Balance During Year 239,984 290,699 239,984 319,608  
Other Short-term Borrowings [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 48,723 47,238 48,447 42,001  
Average Rate During Year (percent) 1.26% 1.98% 1.01% 2.15%  
Maximum Month-end Balance During Year 50,071 46,470 51,409 46,470  
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) 45,873   45,873   45,999
Rate 1.08%   1.08%   1.55%
Federal Funds Purchased, Securities Loaned or Sold under Agreements to Repurchase and Other Short-term Borrowings [Member]
         
Short-term Debt [Abstract]          
Average Amount During Year 271,247 318,028 262,161 327,782  
Average Rate During Year (percent) 1.13% 1.02% 1.06% 0.96%  
Short-term borrowings (includes $2,350 and $1,520 measured at fair value) $ 263,702   $ 263,702   $ 244,105
Rate 0.89%   0.89%   1.03%