Securities Financing Activities - Schedule of securities purchased under resale agreements, netting & securities borrowed (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Securities purchased under resale agreements:
Securities purchased under resale agreements with an appropriate legal opinion, Gross asset balance	$ 354,814,000,000	$ 381,377,000,000
Securities purchased under resale agreements with an appropriate legal opinion, Net asset balance	239,406,000,000	284,430,000,000
Securities purchased under resale agreements where an appropriate legal opinion has not been either sought or obtained	8,279,000,000	10,983,000,000
Total securities purchased under resale agreements, Gross asset balance	363,093,000,000	392,360,000,000
Amounts netted on the Consolidated Balance Sheets	(115,408,000,000)	(96,947,000,000)
Total securities purchased under resale agreements, Net asset balance	247,685,000,000	295,413,000,000
Securities borrowed	111,465,000,000	119,017,000,000
Securities purchased under resale agreements, fair value	248,116,000,000	296,296,000,000
Securities borrowed, amount not offset against collateral, gross	26,900,000,000	28,400,000,000
Portion at Fair Value Measurement [Member]
Securities purchased under resale agreements:
Securities borrowed	3,700,000,000	10,200,000,000
Securities purchased under resale agreements, fair value	$ 25,100,000,000	$ 24,300,000,000