Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 25	$ 3	$ 44	$ 17
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	10	8	31	24
Tax on decrease in net actuarial losses	(16)	0	(15)	0
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures	9	0	9	0
Tax on deferred derivative losses	(2)	0	(9)	0
Tax on deferred derivative losses reclassification adjustment for amounts recognized in income	$ 0	$ 0	$ (1)	$ (1)