Consolidated Statement of Comprehensive Income (Loss) (Parenthetical) (Unaudited) - 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 [Abstract]
Foreign currency translation adjustments, taxes	$ 3	$ (6)	$ (12)	$ 10
Pension and other postretirement benefits
Amortization of prior service cost (credit) included in net periodic benefit cost, taxes	1	0	1	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	2		2
Amortization of actuarial (gain) loss included in net periodic benefit cost, taxes	$ (3)	$ (4)	$ (6)	$ (8)