Consolidated Statements of Changes in Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income taxes effect on net unrealized (losses) gains on securities available for sale	$ (135)	$ (48)
Income taxes effect on net unrealized gains (losses) on derivative financial instruments	(17)	17
Cash dividends declared on common shares, per share	$ 0.160	$ 0.130
Retained Earnings [Member]
Cash dividends declared on common shares, per share	$ 0.16	$ 0.13
Retained Earnings [Member] | Series A Preferred Stock [Member]
Cash dividends declared on Preferred Stock, per share	$ 5.8125	$ 5.8125
Accumulated Other Comprehensive Income (Loss) [Member]
Income taxes effect on net unrealized (losses) gains on securities available for sale	(135)	(48)
Income taxes effect on net unrealized gains (losses) on derivative financial instruments	$ (17)	$ 17