Environmental Rehabilitation and Other Provisions - Provision for Silicosis Settlement (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other provisions [line items]
Short term silicosis settlement provision	$ 11,000,000	$ 16,000,000	$ 0
Provision for Silicosis Settlement
Disclosure of other provisions [line items]
Provision for settlement	54,000,000	47,000,000	63,000,000
Short term silicosis settlement provision	$ 11,000,000	$ 16,000,000	$ 0

The amount of provision for legal proceedings. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Section Example 10 A court case
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=sect_Example10Acourtcase&doctype=Illustrative%20Examples
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2018-01-01
-Paragraph 87
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_87&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_LegalProceedingsProvision
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant