Consolidated Statement of Cash Flows (Unaudited) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities
Net cash provided by operating activities	$ 8,809	$ 3,960
Investing Activities
Proceeds from sales of available-for-sale investment securities	437	1,060
Proceeds from maturities of held-to-maturity investment securities	381	100
Proceeds from maturities of available-for-sale investment securities	5,312	6,614
Purchases of held-to-maturity investment securities	(11,872)	(64)
Purchases of available-for-sale investment securities	(5,750)	(9,904)
Net (increase) decrease in loans outstanding	(3,026)	507
Proceeds from sales of loans	375	1,030
Purchases of loans	(1,193)	(1,807)
Acquisitions, net of cash acquired	650	832
Other, net	(620)	(779)
Net cash used in investing activities	(15,306)	(2,411)
Financing Activities
Net increase (decrease) in deposits	8,844	(602)
Net increase (decrease) in short-term borrowings	(3,019)	1,832
Proceeds from issuance of long-term debt	1,534	2,923
Principal payments or redemption of long-term debt	(484)	(6,684)
Fees paid on exchange of income trust securities for perpetual preferred stock		(4)
Proceeds from issuance of preferred stock	676
Proceeds from issuance of common stock	104	43
Cash dividends paid on preferred stock	(58)	(38)
Cash dividends paid on common stock	(337)	(192)
Net cash provided by (used in) financing activities	7,260	(2,722)
Change in cash and due from banks	763	(1,173)
Cash and due from banks at beginning of period	14,487	6,206
Cash and due from banks at end of period	$ 15,250	$ 5,033