Quarterly report pursuant to Section 13 or 15(d)

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

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Federal Funds Sold or Purchased, Securities Financing Agreements and Short-term Borrowings - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average asset outstanding amount $ 223,978 $ 223,434 $ 224,001 $ 231,379  
Average asset outstanding rate (percent) 0.42% 0.52% 0.48% 0.53%  
Average liability amount during year 255,111 279,425 259,786 311,486  
Average liability rate during year (percent) 0.92% 0.97% 1.01% 0.96%  
Short-term Investments [Abstract]          
Securities borrowed or purchased under agreements to resell 223,310   223,310   190,328
Federal funds sold and securities borrowed or purchased under agreements to resell (includes $63,514 and $75,614 measured at fair value) 223,310   223,310   190,328
Weighted average interest rate 0.44%   0.44%   0.60%
Short-term Debt [Abstract]          
Federal funds purchased 150   150   186
Securities loaned or sold under agreements to repurchase 217,775   217,775   197,920
Short-term borrowings 33,275   33,275   45,999
Total 251,200   251,200   244,105
Weighted average interest rate 0.95%   0.95%   1.03%
Federal funds purchased
          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year 146 183 162 188  
Average liability rate during year (percent) 0.05% 0.03% 0.05% 0.06%  
Maximum month-end liability balance during year 156 166 213 195  
Short-term Debt [Abstract]          
Weighted average interest rate 0.00%   0.00%   0.00%
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 216,099 235,022 214,405 268,549  
Average liability rate during year (percent) 0.90% 0.82% 1.01% 0.80%  
Maximum month-end liability balance during year 226,158 239,556 239,984 319,608  
Short-term Debt [Abstract]          
Weighted average interest rate 0.92%   0.92%   0.92%
Short-term borrowings
          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average liability amount during year 38,866 44,220 45,219 42,749  
Average liability rate during year (percent) 1.02% 1.76% 1.01% 2.01%  
Maximum month-end liability balance during year 40,403 44,291 51,409 46,470  
Short-term Debt [Abstract]          
Weighted average interest rate 1.14%   1.14%   1.55%
Federal funds sold
          
Federal Funds Sold or Purchased, Securities Financing Agreements and Short-Term Borrowings [Line Items]          
Average asset outstanding amount 2 10 3 8  
Average asset outstanding rate (percent) 1.01% 0.74% 0.88% 0.68%  
Maximum month-end asset outstanding amount 0 35 12 35  
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 223,976 223,424 223,998 231,371  
Average asset outstanding rate (percent) 0.42% 0.52% 0.48% 0.53%  
Maximum month-end asset outstanding amount $ 231,077 $ 220,985 $ 240,110 $ 249,791  
Short-term Investments [Abstract]          
Weighted average interest rate 0.44%   0.44%   0.60%