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Share-Based Payments - Summary of Information Relating to the Options and Equity - Settled Instruments (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value of equity instruments granted [line items]
Weighted average share price during the year on the Johannesburg Stock Exchange (US$)	$ 9.25	$ 4.82	$ 3.46

X

- Definition

Disclosure of fair value of equity instruments granted.

+ References

No definition available.

+ Details

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Namespace Prefix:	gfi_
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X

- Definition

The weighted average share price. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Period Type:	duration