Exploration for and evaluation of oil and natural gas resources (Tables)

12 Months Ended

Dec. 31, 2022

Exploration For And Evaluation Of Mineral Resources [Abstract]

Detailed information about exploration and evaluation assets

			$ million
	2022	2021	2020
Exploration and evaluation costs
Exploration expenditure written offa	385	167	9,920
Other exploration costs	200	257	360
Exploration expense for the year	585	424	10,280
Impairment losses	2	1	156
Intangible assets – exploration and appraisal expenditureb	4,213	4,289	4,113
Liabilities	88	98	71
Net assets	4,125	4,191	4,042
Cash used in operating activities	200	257	360
Cash used in investing activities	909	369	674

a2020 includes $2,643 million in the Gulf of Mexico primarily relating to the Paleogene assets, $2,539 million in Canada primarily relating to Terre de Grace, $2,141 million in Brazil, $952 million in Egypt and $832 million in Angola.

bAmount capitalized at 31 December 2022, 2021 and 2020 relates to assets in various regions. The largest of these is approximately $600 million capitalized in the Middle East region (2021 approximately $700 million and 2020 approximately $700 million capitalized in the Middle East Region).