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