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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year $ 257,323 $ 255,111 $ 251,231 $ 259,786  
Average liability rate during year (percent) 0.92% 0.92% 0.99% 1.01%  
Short-term Investments [Abstract]          
Federal funds sold and securities borrowed or purchased under agreements to resell (includes $62,806 and $62,182 measured at fair value) $ 206,681   $ 206,681   $ 191,823
Short-term Debt [Abstract]          
Federal funds purchased and securities loaned or sold under agreements to repurchase (includes $38,914 and $35,357 measured at fair value) 199,238   199,238   201,277
Short-term borrowings 34,518   34,518   31,172
Total $ 233,756   $ 233,756   $ 232,449
Weighted average interest rate 0.90%   0.90%   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 $ 219,613 $ 216,245 $ 218,112 $ 214,567  
Average liability rate during year (percent) 0.83% 0.90% 0.92% 1.01%  
Maximum month-end liability balance during year $ 235,232 $ 226,288 $ 235,232 $ 240,154  
Short-term Debt [Abstract]          
Weighted average interest rate 0.81%   0.81%   0.98%
Short-term borrowings          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year $ 37,710 $ 38,866 $ 33,119 $ 45,219  
Average liability rate during year (percent) 1.44% 1.02% 1.47% 1.01%  
Maximum month-end liability balance during year $ 40,110 $ 40,403 $ 40,110 $ 51,409  
Short-term Debt [Abstract]          
Weighted average interest rate 1.46%   1.46%   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 $ 210,127 $ 223,978 $ 212,781 $ 224,001  
Average asset outstanding rate (percent) 0.52% 0.42% 0.49% 0.48%  
Maximum month-end asset outstanding amount $ 217,701 $ 231,077 $ 226,502 $ 240,122  
Short-term Investments [Abstract]          
Weighted average interest rate 0.47%   0.47%   0.47%