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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Other Operating Activities |  |  |  |  |  |  |  |  |  |  | $ 56 |
Metals inventory adjustments |  |  | $ 12 |  |  |  |  |  | $ 4 | $ 8 | 36 |
Production and delivery |  |  |  |  |  |  |  |  | 11,691 | 10,266 | 10,687 |
Total cost of sales |  |  |  |  |  |  |  |  | 13,445 | 11,980 | 17,534 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 443 | 477 | 597 |
Exploration Expense |  |  |  |  |  |  |  |  | 105 | 93 | 63 |
Environmental obligations and shutdown costs |  |  |  |  |  |  |  |  | 89 | 244 | 14 |
Costs and Expenses |  |  |  |  |  |  |  |  | 13,874 | 12,713 | 17,559 |
Operating income (loss) | $ 316 | $ 1,315 | $ 1,664 | $ 1,459 | $ 1,479 | $ 928 | $ 686 | $ 597 | 4,754 | 3,690 | (2,729) |
Accrued income taxes and timing of other tax payments |  |  |  |  |  |  |  |  | (472) | 457 | 136 |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  | 3,863 | 4,666 | 3,737 |
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves |  |  |  |  |  |  |  |  |  |  | 4,900 |
Impairment of Oil and Gas Properties |  |  |  |  |  |  |  |  | 0 | 0 | 4,317 |
Foreign currency transaction gains (losses), before tax |  |  |  |  |  |  |  |  | 14 | (5) | 32 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | (97) | 17 | 11 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (5,018) | (1,321) | 3,553 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | (255) | 290 | 4,124 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Before Reclassification of Assets Held for Sale |  |  |  |  | 4,631 |  |  |  |  | 4,631 | 4,403 | $ 324
Other income (expense), net |  |  |  |  |  |  |  |  | 76 | (8) | (14) |
Cumulative Effect of New Accounting Principle in Period of Adoption | 0 |  |  |  |  |  |  |  | $ 0 |  |  |
United States oil and gas operations |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest |  |  |  |  |  |  |  |  |  |  | 7 |
Copper |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ultimate copper recovery from leach stockpiles |  |  |  |  |  |  |  |  | 90.00% |  |  |
Percentage of copper ultimately recoverable from newly placed material on active stockpiles extracted during the first year |  |  |  |  |  |  |  |  | 80.00% |  |  |
PT-FI |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Metals inventory adjustments | $ 43 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of subsidiary | 48.76% |  |  |  |  |  |  |  | 48.76% |  |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Other Operating Activities |  |  |  |  |  |  |  |  |  |  | 48 |
Production and delivery |  |  |  |  |  |  |  |  |  | 10,308 | 10,733 |
Total cost of sales |  |  |  |  |  |  |  |  |  | 12,022 | 17,580 |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 484 | 607 |
Exploration Expense |  |  |  |  |  |  |  |  |  | 94 | 64 |
Environmental obligations and shutdown costs |  |  |  |  |  |  |  |  |  | 251 | 20 |
Costs and Expenses |  |  |  |  |  |  |  |  |  | 12,770 | 17,622 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 3,633 | (2,792) |
Accrued income taxes and timing of other tax payments |  |  |  |  |  |  |  |  |  | 473 |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  |  | 4,682 | 3,729 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  |  | (25) | 8 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | (1,363) | 3,550 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  |  | 264 | 4,113 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Before Reclassification of Assets Held for Sale |  |  |  |  | 4,447 |  |  |  |  | 4,447 | 4,245 | 177
Other income (expense), net |  |  |  |  |  |  |  |  |  | 49 | 49 |
Accounting Standards Update 2017-05 [Member] | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | (42) | (46) |
Total cost of sales |  |  |  |  |  |  |  |  |  | (42) | (46) |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | (7) | (10) |
Exploration Expense |  |  |  |  |  |  |  |  |  | (1) | (1) |
Environmental obligations and shutdown costs |  |  |  |  |  |  |  |  |  | (7) | (6) |
Costs and Expenses |  |  |  |  |  |  |  |  |  | (57) | (63) |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 57 | 63 |
Other income (expense), net |  |  |  |  |  |  |  |  |  | (57) | (63) |
Accounting Standards Update 2016-18 [Member] | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Other Operating Activities |  |  |  |  |  |  |  |  |  |  | 8 |
Accrued income taxes and timing of other tax payments |  |  |  |  |  |  |  |  |  | (16) |  |
Net cash (used in) provided by operating activities |  |  |  |  |  |  |  |  |  | (16) | 8 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  |  | 42 | 3 |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | 42 | 3 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  |  | 26 | 11 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Before Reclassification of Assets Held for Sale |  |  |  |  | $ 184 |  |  |  |  | $ 184 | $ 158 | $ 147
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ (79) |  |  |  |  |  |  |  | $ (79) |  |  |

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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