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SIGNIFICANT ACCOUNTING POLICIES - Post-Retirement Benefits (Details)	12 Months Ended
	Dec. 31, 2018
Employees
Disclosure of defined benefit plans [line items]
Employer matching contribution, percent of salary	6.00%
Officers
Disclosure of defined benefit plans [line items]
Employer matching contribution, percent of salary	15.00%

X

- Definition

Defined benefit plans, employer matching contribution, percent of employees' gross pay

+ References

No definition available.

+ Details

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Namespace Prefix:	abx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	abx_ClassofemployeeAxis=abx_EmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	abx_ClassofemployeeAxis=abx_Officer1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: