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
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year $ 252,088 $ 271,247 $ 248,133 $ 262,161  
Average liability rate during year (percent) 1.09% 1.13% 1.03% 1.06%  
Short-term Investments [Abstract]          
Federal funds sold and securities borrowed or purchased under agreements to resell (includes $70,791 and $62,182 measured at fair value) $ 199,903   $ 199,903   $ 191,823
Short-term Debt [Abstract]          
Federal funds purchased and securities loaned or sold under agreements to repurchase (includes $32,017 and $35,357 measured at fair value) 213,024   213,024   201,277
Short-term borrowings 39,903   39,903   31,172
Total $ 252,927   $ 252,927   $ 232,449
Weighted average interest rate 0.95%   0.95%   1.04%
Federal funds purchased and securities loaned or sold under agreements to repurchase          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year $ 219,946 $ 222,524 $ 217,348 $ 213,714  
Average liability rate during year (percent) 1.03% 1.10% 0.97% 1.07%  
Maximum month-end liability balance during year $ 227,753 $ 240,154 $ 227,753 $ 240,154  
Short-term Debt [Abstract]          
Weighted average interest rate 0.92%   0.92%   0.98%
Short-term borrowings          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year $ 32,142 $ 48,723 $ 30,785 $ 48,447  
Average liability rate during year (percent) 1.49% 1.26% 1.48% 1.01%  
Maximum month-end liability balance during year $ 39,903 $ 50,071 $ 39,903 $ 51,409  
Short-term Debt [Abstract]          
Weighted average interest rate 1.18%   1.18%   1.47%
Federal funds sold and securities borrowed or purchased under agreements to resell          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average asset outstanding amount $ 214,326 $ 235,393 $ 214,130 $ 224,012  
Average asset outstanding rate (percent) 0.50% 0.51% 0.47% 0.51%  
Maximum month-end asset outstanding amount $ 224,701 $ 240,122 $ 226,502 $ 240,122  
Short-term Investments [Abstract]          
Weighted average interest rate 0.51%   0.51%   0.47%