Goodwill and impairment review of goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets [Abstract]

Disclosure of reconciliation of goodwill

			$ million
	2018		2017
Cost
At 1 January	12,163		11,805
Exchange adjustments	(210	)	336
Acquisitions and other additionsa	1,046		83
Deletions	(184	)	(61	)
At 31 December	12,815		12,163
Impairment losses
At 1 January	612		611
Exchange adjustments	—		1
Deletions	(1	)	—
At 31 December	611		612
Net book amount at 31 December	12,204		11,551
Net book amount at 1 January	11,551		11,194

^a 2018 principally relates to the purchase of an additional 16.5% share in the Clair field in the North Sea. See Note 3 - Other significant transactions for further information.

Impairment review of goodwill

		$ million
Goodwill at 31 December	2018	2017
Upstream	8,346	7,728
Downstream	3,802	3,758
Other businesses and corporate	56	65
	12,204	11,551

Schedule of goodwill

		$ million
	2018	2017
Goodwill	8,346	7,728
Excess of recoverable amount over carrying amount	53,391	27,705

						$ million
			2018			2017
	Lubricants	Other	Total	Lubricants	Other	Total
Goodwill	2,692	1,110	3,802	2,849	909	3,758