Consolidated Statements of Changes in Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income taxes effect on net unrealized (losses) gains on securities available for sale	$ (76)	$ (32)	$ 35
Income taxes effect on net unrealized gains(losses) on derivative financial instruments	(19)	17	2
Income taxes effect on foreign currency translation adjustments	(1)	(14)	(8)
Income taxes effect on net pension and postretirement benefit costs	$ 19	$ (2)	$ (27)
Cash dividends declared on common shares, per share (in dollars per share)	$ 0.33	$ 0.29	$ 0.250
Series A Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)	7.75	$ 7.75	$ 7.75
Series C Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)	0.539063
Series D Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)	$ 13.33