Consolidated Statements of Comprehensive Income (Unaudited) (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):
Tax on foreign currency translation	$ (3)	$ 10	$ 14	$ (24)
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	16	18
Tax on decrease (increase) in net actuarial losses	1	11	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)	1	0	0	2
Tax on deferred derivative gains (losses) reclassification adjustment for amounts recognized in income	(1)	(1)	(2)	(2)
Tax on unrealized investment gains (losses)	$ 0	$ (3)	$ 0	$ 1