Production and similar taxes

6 Months Ended

Jun. 30, 2019

Analysis of income and expense [abstract]

Production and similar taxes

Production and similar taxes

	Second	Second	First	First
	quarter	quarter	half	half
$ million	2019	2018	2019	2018
US	79	89	160	179
Non-US	292	442	635	720
	371	531	795	899