Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Comprehensive Income Loss Textuals [Abstract]
Net unrealized securities gains (losses), tax	$ (2)	$ (5)	$ (13)	$ 19
Foreign currency translation adjustments, tax	181	119	221	41
Net unrealized pension and other postretirement benefit gains, tax	$ 8	$ 9	$ 24	$ 29