Consolidated Statements of Changes in Shareholder's Equity - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income/(loss)	Noncontrolling interests
Balance at Dec. 31, 2015	$ 2,975	$ 745	$ 2	$ 2,999	$ (897)	$ 126
Increase (Decrease) in Shareholder's Equity [Roll Forward]
Profit of consolidated companies	101			100		1
Foreign currency translation, net of tax	173				172	1
Derivative financial instruments, net of tax	1				1
Balance at Mar. 31, 2016	3,250	745	2	3,099	(724)	128
Balance at Dec. 31, 2016	2,985	745	2	3,108	(995)	125
Increase (Decrease) in Shareholder's Equity [Roll Forward]
Profit of consolidated companies	117			115		2
Foreign currency translation, net of tax	80				80	0
Derivative financial instruments, net of tax	2				2
Balance at Mar. 31, 2017	$ 3,184	$ 745	$ 2	$ 3,223	$ (913)	$ 127