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PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Schedule of PPE) (Details) - USD ($) | 12 Months Ended | 156 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 30, 2008 | Dec. 31, 2007 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | $ 74,883,000,000 | $ 73,357,000,000 |  |  |  | $ 73,357,000,000
Accumulated depreciation, depletion and amortization | (45,065,000,000) | (43,773,000,000) |  |  |  | (43,773,000,000)
Property, plant, equipment and mining development costs, net | 29,818,000,000 | 29,584,000,000 |  |  |  | 29,584,000,000
Proven and probable reserves [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 7,142,000,000 | 7,087,000,000 |  |  |  | 7,087,000,000
Transfer From Value Beyond Proven And Probable Reserves To Proven And Probable Reserves | 100,000 | 0 |  |  |  | 811,000,000
Value beyond proven and probable reserves (VBPP) [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Payments to Acquire Mineral Rights |  |  |  |  | $ 1,600,000,000 |
Property, plant, equipment and mining development costs | 376,000,000 | 465,000,000 |  |  |  | 465,000,000
Property, Plant and Equipment, Transfers and Changes |  |  |  | $ 497,000,000 |  |
Mine development and other |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 10,686,000,000 | 8,180,000,000 |  |  |  | 8,180,000,000
Buildings and infrastructure |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 9,214,000,000 | 8,435,000,000 |  |  |  | 8,435,000,000
Machinery and equipment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 14,235,000,000 | 13,312,000,000 |  |  |  | 13,312,000,000
Mobile equipment |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 4,495,000,000 | 4,320,000,000 |  |  |  | 4,320,000,000
Construction in progress |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 1,454,000,000 | 4,265,000,000 |  |  |  | 4,265,000,000
Oil and Gas Properties [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant, equipment and mining development costs | 27,281,000,000 | 27,293,000,000 |  |  |  | 27,293,000,000
Accumulated depreciation, depletion and amortization | (27,300,000,000) | (27,300,000,000) |  |  |  | $ (27,300,000,000)
Discontinued Operations |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Payments to Acquire Mineral Rights |  |  |  |  | $ 634,000,000 |
Mining Operations [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Capitalized interest | $ 147,000,000 | $ 149,000,000 | $ 96,000,000 |  |  |

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