Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income taxes effect on net unrealized (losses) gains on securities available for sale	$ 35	$ 14
Income taxes effect on net unrealized gains (losses) on derivative financial instruments	37	(3)
Income taxes effect on foreign currency translation adjustments	(11)	(3)
Income taxes effect on net pension and postretirement benefit costs	$ (12)	$ 13
Cash dividends declared on common shares, per share	$ 0.215	$ 0.185
Retained Earnings [Member]
Cash dividends declared on common shares, per share	$ 0.215	$ 0.185
Accumulated Other Comprehensive Income (Loss) [Member]
Income taxes effect on net unrealized (losses) gains on securities available for sale	$ 35	$ 14
Income taxes effect on net unrealized gains (losses) on derivative financial instruments	37	(3)
Income taxes effect on foreign currency translation adjustments	(11)	(3)
Income taxes effect on net pension and postretirement benefit costs	$ (12)	$ 13
Series A Preferred Stock [Member] | Retained Earnings [Member]
Cash dividends declared on Preferred Stock, per share	$ 5.8125	$ 5.8125