Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Comprehensive Income Loss Textuals [Abstract]
Net unrealized securities gains (losses), tax	$ (9)	$ (2)	$ (7)	$ (13)
Foreign currency translation adjustments, tax	(24)	181	37	221
Net unrealized pension and other postretirement benefit gains, tax	$ 7	$ 8	$ 36	$ 24