Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income Loss Textuals [Abstract]
Net unrealized securities gains (losses), tax	$ 2	$ (10)	$ 2	$ (11)
Foreign currency translation adjustments, tax	100	(48)	61	40
Net unrealized pension and other postretirement benefit gains, tax	$ 10	$ (3)	$ 29	$ 16