Segment analysis - Segment assets and segment revenue (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) customer	Dec. 31, 2016 USD ($) customer	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($)
Segment analysis
Number of customers with a percentage of total revenues greater than 10% \| customer	0	0	1
TOTAL ASSETS	$ 11,191	$ 10,851	$ 6,902	$ 7,425
Revenue	8,596	7,014	5,795
Non-current assets	7,725	7,608	4,692	$ 5,122
United States
Segment analysis
Revenue	3,261	2,695	2,227
Non-current assets	2,218	2,307
United Kingdom
Segment analysis
Revenue	879	801	738
Non-current assets	676	556
Germany
Segment analysis
Revenue	801	726	639
Non-current assets	1,025	801
Luxembourg
Segment analysis
Revenue	3	2	$ 2
Non-current assets	$ 0	$ 0

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details