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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Short-term Debt [Abstract]      
Amount at December 31 $ 45,999,000,000 $ 30,731,000,000  
Federal Funds Sold Securities Borrowed or Purchased Under Agreements to Resell and Short term Borrowings Textuals [Abstract]      
Short Term Bank Notes Outstanding 15,100,000,000 3,900,000,000  
Federal funds sold [Member]
     
Short-term Debt [Abstract]      
Amount at December 31 0 600,000,000 100,000,000
Rate at December 31 0.00% 0.54% 0.71%
Average Amount During Year 7,000,000 351,000,000 273,000,000
Average Rate During Year 0.69% 0.43% 0.39%
Maximum Month-end Balance During Year 550,000,000 600,000,000 782,000,000
Securities borrowed or purchased under agreements to resell [Member]
     
Short-term Debt [Abstract]      
Amount at December 31 190,328,000,000 219,324,000,000 211,083,000,000
Rate at December 31 0.60% 0.92% 0.76%
Average Amount During Year 224,324,000,000 235,691,000,000 244,796,000,000
Average Rate During Year 0.55% 0.64% 0.88%
Maximum Month-end Balance During Year 249,791,000,000 252,985,000,000 270,201,000,000
Federal Funds Purchased [Member]
     
Short-term Debt [Abstract]      
Amount at December 31 186,000,000 1,151,000,000 243,000,000
Rate at December 31 0.00% 0.17% 0.06%
Average Amount During Year 192,000,000 384,000,000 1,658,000,000
Average Rate During Year 0.06% 0.11% 0.08%
Maximum Month-end Balance During Year 1,272,000,000 1,211,000,000 4,133,000,000
Securities Sold under Agreements to Repurchase [Member]
     
Short-term Debt [Abstract]      
Amount at December 31 197,920,000,000 292,108,000,000 214,621,000,000
Rate at December 31 0.92% 1.11% 1.08%
Average Amount During Year 257,409,000,000 281,516,000,000 270,718,000,000
Average Rate During Year 0.81% 0.98% 1.31%
Maximum Month-end Balance During Year 319,608,000,000 319,401,000,000 293,519,000,000
Other Short-term Borrowings [Member]
     
Short-term Debt [Abstract]      
Amount at December 31 45,999,000,000 30,731,000,000 35,698,000,000
Rate at December 31 1.55% 3.08% 2.36%
Average Amount During Year 43,816,000,000 36,500,000,000 51,893,000,000
Average Rate During Year 1.89% 2.22% 2.00%
Maximum Month-end Balance During Year 48,387,000,000 40,129,000,000 62,621,000,000
Bank of America, N.A. [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