Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Income taxes effect on net unrealized (losses) gains on securities available for sale	$ 33	$ (20)	$ 35	$ 14
Income taxes effect on net unrealized (losses) gains on derivative financial instruments	28	(6)	37	(3)
Income taxes effect on foreign currency translation adjustments	(3)	(3)	(11)	(3)
Income taxes effect on net pension and postretirement benefit costs	$ (15)	$ 10	$ (12)	$ 13