Supplemental financial information - Other income (expense), net (OI&E) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Financial Information [Abstract]
Income from settlements related to intellectual property infringement	$ 188	$ 0	$ 0
Lease income	14	14	14
Interest income	11	6	7
Investment gains (losses)	5	3	5
Currency exchange gains (losses)	2	5	(4)
Tax interest income (expense)	(3)	8	6
Other	(6)	(4)	(7)
Total	$ 211	$ 32	$ 21