Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Common stock dividends, per share	$ 0.20		$ 0.12		$ 0.04
U.S. Treasury preferred stock dividends, per share	$ 0		$ 1,236		$ 5,000
Treasury Stock, Value	$ (590)	[1]	$ (792)	[1]
Stockholders' Equity Attributable to Noncontrolling Interest	114		107
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	520		1,863		1,526
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	532		569		532
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(743)		(683)		(442)
Treasury Stock and Other
Treasury Stock, Value	(656)		(851)		(974)
Deferred Compensation Equity	(48)		(48)		(43)
Stockholders' Equity Attributable to Noncontrolling Interest	$ 114		$ 107		$ 129
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid	$ 4,067		$ 4,056		$ 4,056
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid	$ 4,027
Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid	$ 4,052

[1] 4 Includes noncontrolling interest held114 107