Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Total	Preferred stock	Common stock	Common stock issuable	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss), net	Treasury stock
Beginning Balance at Dec. 31, 2009	$ 7,752,907	$ 730,235	$ 60,198	$ 4,342	$ 2,442,947	$ 5,076,884	$ (335,997)	$ (225,702)
Comprehensive income:
Net income	531,719					531,719
Other comprehensive income, net of tax and reclassification adjustments:
Unrealized (gain) losses on investment securities	140,392						140,392
Defined benefit plans liability adjustment	3,262						3,262
Unrealized gain on terminated cash flow hedge	(211)						(211)
Other comprehensive income	675,162
Preferred stock cash dividends	(30,169)					(30,169)
Amortization of preferred stock discount		7,744				(7,744)
Repayment of management stock ownership program receivable	2,686				2,686
Stock-based compensation plans:
Compensation expense, net	38,127				(3,545)			41,672
Exercises of stock options, net	33,253				(25,639)			58,892
Stock purchase plan	8,998				(8,482)			17,480
Directors' stock plan	827				(289)			1,116
Deferred compensation plans, net, including dividend equivalents	(27)			(196)	(295)	(147)		611
Other	1,354				1,354
Common stock cash dividends - $2.10 and $2.10 per share in 2011 and 2010 respectively	(251,345)					(251,345)
Ending Balance at Sep. 30, 2010	8,231,773	737,979	60,198	4,146	2,408,737	5,319,198	(192,554)	(105,931)
Beginning Balance at Dec. 31, 2010	8,357,695	740,657	60,198	4,189	2,398,615	5,426,701	(205,220)	(67,445)
Comprehensive income:
Net income	711,739					711,739
Other comprehensive income, net of tax and reclassification adjustments:
Unrealized (gain) losses on investment securities	6,970						6,970
Defined benefit plans liability adjustment	6,431						6,431
Unrealized gain on terminated cash flow hedge	(211)						(211)
Foreign currency translation adjustment	(503)						(503)
Other comprehensive income	724,426
Acquisition of Wilmington Trust Corporation - common stock issued	405,557		2,348		403,209
Partial redemption of Series A preferred stock	(370,000)	(370,000)
Conversion of Series B preferred stock into 433,144 shares of common stock		(26,500)	192		21,754			4,554
Issuance of Series D preferred stock	495,000	500,000			(5,000)
Preferred stock cash dividends	(34,125)					(34,125)
Amortization of preferred stock discount		18,560				(18,560)
Stock-based compensation plans:
Compensation expense, net	32,352		36		650			31,666
Exercises of stock options, net	23,444		29		(6,691)			30,106
Directors' stock plan	1,028		2		414			612
Deferred compensation plans, net, including dividend equivalents	40			(123)	(203)	(141)		507
Other	1,395				1,395
Common stock cash dividends - $2.10 and $2.10 per share in 2011 and 2010 respectively	(261,686)					(261,686)
Ending Balance at Sep. 30, 2011	$ 9,375,126	$ 862,717	$ 62,805	$ 4,066	$ 2,814,143	$ 5,823,928	$ (192,533)	$ 0