Consolidated Statements of Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012		Dec. 31, 2011
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 21,194		$ 20,241		$ 20,985		$ 20,066
Common Stock, Shares, Outstanding	540,187,000				538,959,000
Net income	352		250
Other Comprehensive Income (Loss), Net of Tax	(124)		(75)
Noncontrolling Interest, Period Increase (Decrease)			4
Dividends, Common Stock, Cash	(27)		(27)
Dividends, Preferred Stock, Cash	(9)	[1]	(3)
Stock Issued During Period, Value, Stock Options Exercised	5		4
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	3		8
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	7		7
Stock Issued During Period, Value, Employee Benefit Plan	2		7
Preferred Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	725		275		725		275
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	550		550		550		550
Common Stock, Shares, Outstanding	540,000,000		538,000,000		539,000,000		537,000,000
Common Stock [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0		0
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	1,000,000		1,000,000
Stock Issued During Period, Shares, Employee Benefit Plan	0		0
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	9,132		9,243		9,174		9,306
Stock Issued During Period, Value, Stock Options Exercised	(8)		(6)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(33)		(50)
Stock Issued During Period, Value, Employee Benefit Plan	(1)		(7)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	11,133		9,198		10,817		8,978
Net income	352		250
Dividends, Common Stock, Cash	(27)		(27)
Dividends, Preferred Stock, Cash	(9)	[1]	(3)
Treasury Stock and Other
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(531)	[2]	(699)	[2]	(590)	[2]	(792)	[2]
Noncontrolling Interest, Period Increase (Decrease)			4	[2]
Stock Issued During Period, Value, Stock Options Exercised	13	[2]	10	[2]
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	36	[2]	58	[2]
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition	7	[2]	7	[2]
Stock Issued During Period, Value, Employee Benefit Plan	3	[2]	14	[2]
Accumulated Other Comprehensive Income (Loss) [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	185	[3]	1,674	[3]	309	[3]	1,749	[3]
Other Comprehensive Income (Loss), Net of Tax	$ (124)	[3]	$ (75)	[3]

[1] Dividends were $1,000 per share for Perpetual Preferred Stock Series A and B and $1,387 per share for Perpetual Preferred Stock Series E for the three months ended March 31, 2013.

[2] At March 31, 2013, includes ($569) million for treasury stock, ($76) million for compensation element of restricted stock, and $114 million for noncontrolling interest. At March 31, 2012, includes ($737) million for treasury stock, ($73) million for compensation element of restricted stock, and $111 million for noncontrolling interest.

[3] Components of AOCI at March 31, 2013, included $447 million in unrealized net gains on AFS securities, $461 million in unrealized net gains on derivative financial instruments, and ($723) million related to employee benefit plans. At March 31, 2012, components included $1,913 million in unrealized net gains on AFS securities, $468 million in unrealized net gains on derivative financial instruments, and ($707) million related to employee benefit plans.