Deposits and Borrowings (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2010	Jun. 30, 2011	Dec. 31, 2009
Deposits and Borrowings
Interest-bearing deposits	$ 107,162,000,000	$ 109,278,000,000
Interest-bearing deposits represented by large denomination certificates of $100,000 or more	6,500,000,000	5,800,000,000
Number of years after filing that shelf registration statement expires		three
Federal Home Loan Bank Stock	269,000,000	230,000,000
Increase in assets due to new consolidation guidance			41,900,000,000
Increase in securitized debt obligations due to new consolidation guidance			44,300,000,000
Fair value adjustments to senior and subordinated notes	578,000,000	591,000,000
Amount of two senior notes that matured during the year	671,000,000
Senior and Subordinated Global Bank Notes outstanding	820,000,000	817,000,000
Advances from Federal Home Loan Banks		3,000,000,000
Senior and subordinated notes outstanding	8,650,000,000	8,664,000,000
Junior Subordinated Notes	3,642,000,000	3,642,000,000
Junior subordinated borrowings called or matured		0
Outstanding FHLB advances	1,144,000,000	1,129,000,000
Short-term FHLB advances	$ 0	$ 1,865,000,000