COMMITMENTS AND CONTINGENCIES - Other Legal Matters - NWG, etc. (Details) $ in Millions, $ in Millions					1 Months Ended		12 Months Ended
	Oct. 15, 2019 item	Feb. 26, 2014 CAD ($)	Sep. 24, 2012 USD ($)	Apr. 08, 2008	Jun. 30, 2019 USD ($)	Jan. 31, 2019 item	Dec. 31, 2018 item	Dec. 31, 2016 USD ($) subsidiary	Dec. 31, 2019	Sep. 30, 2007	Jun. 30, 2007
Mexican Tax Authority [Member]
Loss contingencies
Number of subsidiaries subject to examination | subsidiary								2
Tax settlement paid					$ 74
Mexican Tax Authority [Member] | Tax Year 2008 [Member]
Loss contingencies
Amount of tax, interest and penalties asserted as disputed amount								$ 11
Mexican Tax Authority [Member] | Tax Year 2009 [Member]
Loss contingencies
Amount of tax, interest and penalties asserted as disputed amount								$ 102
Goldcorp [Member]
Loss contingencies
Ownership/Economic interest (as a percent)									100.00%
Ghana Parliament Cases [Member]
Loss contingencies
Number of codefendants | item						33
Loss contingency number of plaintiffs | item							2
State Of Zacatecas Ecological Tax [Member]
Loss contingencies
Number of issues affirmed | item	1
North America | Pending Litigation
Loss contingencies
Uranium mining moratorium term				3 years
Jacob Safra | NWG Investments Inc
Loss contingencies
Ownership/Economic interest (as a percent)										100.00%
NWG Investments Inc | NewWest Gold
Loss contingencies
Ownership/Economic interest (as a percent)										86.00%
NWG Investments Inc | NWG New York Case | Pending Litigation
Loss contingencies
Damages sought			$ 750
NWG Investments Inc | NWG Ontario Complaint
Loss contingencies
Damages sought		$ 1,200
Fronteer | Aurora
Loss contingencies
Ownership/Economic interest (as a percent)											47.00%