Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income taxes effect on net unrealized (losses) gains on securities available for sale	(6)	(12)
Income taxes effect on net unrealized (losses) gains on derivative financial instruments	7	(5)
Cash dividends declared on common shares, per share	0.03	0.01
Series A Preferred Stock
Cash dividends accrued on Cumulative Series B Preferred Stock, (% per annum)	7.75%	7.75%
Retained Earnings
Cash dividends declared on common shares, per share	0.03	0.01
Retained Earnings | Series A Preferred Stock
Cash dividends declared on Preferred Stock, per share/annum	1.9375	1.9375
Retained Earnings | Series B Preferred Stock
Cash dividends accrued on Cumulative Series B Preferred Stock, (% per annum)		5.00%
Accumulated Other Comprehensive Income (Loss)
Income taxes effect on net unrealized (losses) gains on securities available for sale	(6)	(12)
Income taxes effect on net unrealized (losses) gains on derivative financial instruments	7	(5)