Annual report pursuant to Section 13 and 15(d)

Federal Funds Sold, Securities Borrowed or Purchased Under Agreements to Resell and Short-term Borrowings (Details)

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Federal Funds Sold, Securities Borrowed or Purchased Under Agreements to Resell and Short-term Borrowings (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings $ 35,698,000,000 $ 59,962,000,000  
Federal Funds Sold Securities Borrowed or Purchased Under Agreements to Resell and Short term Borrowings Textuals [Abstract]      
Short Term Bank Notes Outstanding 1,400,000,000 14,600,000,000  
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
     
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 211,183,000,000 209,616,000,000 189,933,000,000
Rate at December 31 0.76% 0.85% 0.78%
Average Amount During Year 245,069,000,000 256,943,000,000 235,764,000,000
Average Rate During Year 0.88% 0.71% 1.23%
Maximum Month-end Balance During Year 270,473,000,000 314,932,000,000 271,321,000,000
Federal Funds Purchased [Member]
     
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 243,000,000 1,458,000,000 4,814,000,000
Rate at December 31 0.06% 0.14% 0.09%
Average Amount During Year 1,658,000,000 4,718,000,000 4,239,000,000
Average Rate During Year 0.08% 0.15% 0.05%
Maximum Month-end Balance During Year 4,133,000,000 8,320,000,000 4,814,000,000
Securities Sold under Agreements to Repurchase [Member]
     
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 214,621,000,000 243,901,000,000 250,371,000,000
Rate at December 31 1.08% 1.15% 0.39%
Average Amount During Year 270,718,000,000 348,936,000,000 365,624,000,000
Average Rate During Year 1.31% 0.74% 0.96%
Maximum Month-end Balance During Year 293,519,000,000 458,532,000,000 407,967,000,000
Commercial Paper [Member]
     
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 23,000,000 15,093,000,000 13,131,000,000
Rate at December 31 1.70% 0.65% 0.65%
Average Amount During Year 8,897,000,000 25,923,000,000 26,697,000,000
Average Rate During Year 0.53% 0.56% 1.03%
Maximum Month-end Balance During Year 21,212,000,000 36,236,000,000 37,025,000,000
Other Short-term Borrowings [Member]
     
Short-term Debt [Abstract]      
Commercial paper and other short-term borrowings 35,675,000,000 44,869,000,000 56,393,000,000
Rate at December 31 2.35% 2.02% 1.72%
Average Amount During Year 42,996,000,000 50,752,000,000 92,084,000,000
Average Rate During Year 2.31% 1.88% 1.87%
Maximum Month-end Balance During Year 47,087,000,000 63,081,000,000 169,602,000,000
Parent Company And Other Subsidiaries Member [Member]
     
Federal Funds Sold Securities Borrowed or Purchased Under Agreements to Resell and Short term Borrowings Textuals [Abstract]      
Maximum Of Bank Notes Outstanding With Fixed Or Floating Rate $ 75,000,000,000