Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 16	$ (3)	$ 19	$ 14
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	11	8	21	16
Tax on decrease in net actuarial losses	0	1	1	0
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures	0	0	0	0
Tax on deferred derivative gains (losses)	(5)	1	(7)	0
Tax on deferred derivative gains (losses) reclassification adjustment for amounts recognized in income	$ 0	$ (1)	$ (1)	$ (2)