Goodwill and impairment review of goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Intangible Assets [Abstract]

Disclosure of reconciliation of goodwill

			$ million
	2017		2016
Cost
At 1 January	11,805		12,236
Exchange adjustments	336		(544	)
Acquisitions	83		247
Deletions	(61	)	(134	)
At 31 December	12,163		11,805
Impairment losses
At 1 January	611		609
Exchange adjustments	1		5
Deletions	—		(3	)
At 31 December	612		611
Net book amount at 31 December	11,551		11,194
Net book amount at 1 January	11,194		11,627

Impairment review of goodwill

		$ million
Goodwill at 31 December	2017	2016
Upstream	7,728	7,726
Downstream	3,758	3,401
Other businesses and corporate	65	67
	11,551	11,194

Schedule of goodwill

						$ million
			2017			2016
	Lubricants	Other	Total	Lubricants	Other	Total
Goodwill	2,849	909	3,758	2,571	830	3,401

		$ million
	2017	2016
Goodwill	7,728	7,726
Excess of recoverable amount over carrying amount	27,705	26,035