Consolidated Statements of Changes in Shareholders' Equity (USD $) In Millions	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
BALANCE at Dec. 31, 2009	$ 2,151	$ 894	$ 740	$ (336)	$ 5,161	$ (1,581)	$ 7,029
BALANCE (in shares) at Dec. 31, 2009		151.2
Net income					122		122
Other comprehensive income, net of tax				96			96
Total comprehensive income							218
Cash dividends declared on preferred stock					(38)		(38)
Cash dividends declared on common stock ($0.20 and $0.10 per share for the six months ended 2011 and 2010 respectively)					(18)		(18)
Purchase of common stock						(4)	(4)
Issuance of common stock		125	724				849
Issuance of common stock (in shares)		25.1
Redemption of preferred stock	(2,250)						(2,250)
Redemption discount accretion on preferred stock	94				(94)
Accretion of discount on preferred stock	5				(5)
Net issuance of common stock under employee stock plans			(5)		(4)	6	(3)
Share-based compensation			11				11
Other			(3)			1	(2)
BALANCE at Jun. 30, 2010		1,019	1,467	(240)	5,124	(1,578)	5,792
BALANCE (in shares) at Jun. 30, 2010		176.3
BALANCE at Dec. 31, 2010		1,019	1,481	(389)	5,247	(1,565)	5,793
BALANCE (in shares) at Dec. 31, 2010		176.5
Net income					199		199
Other comprehensive income, net of tax				81			81
Total comprehensive income							280
Cash dividends declared on common stock ($0.20 and $0.10 per share for the six months ended 2011 and 2010 respectively)					(35)		(35)
Purchase of common stock						(21)	(21)
Purchase of common stock (in shares)		(0.5)
Net issuance of common stock under employee stock plans			(30)		(16)	46
Net issuance of common stock under employee stock plans (in shares)		0.8
Share-based compensation			21				21
BALANCE at Jun. 30, 2011		$ 1,019	$ 1,472	$ (308)	$ 5,395	$ (1,540)	$ 6,038
BALANCE (in shares) at Jun. 30, 2011		176.8