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):
Tax on foreign currency translation	$ 3	$ (18)	$ 17	$ (42)
Tax on foreign currency translation reclassification adjustment recognized in income	0	0	0	0
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	8	9	24	27
Tax on decrease (increase) in net actuarial losses	0	0	0	11
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)	0	1	0	3
Tax on deferred derivative gains (losses) reclassification adjustment for amounts recognized in income	0	0	(1)	(2)
Tax on unrealized investment (losses) gains	$ 0	$ 0	$ 0	$ 1