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LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES - LEGAL MATTERS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Long-term Purchase Commitment [Line Items] |  |  |  |
Potential income tax expense | $ 925 |  |  |
Federal |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Potential income tax expense | 898 |  |  |
State |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Potential income tax expense | 27 |  |  |
Anadarko Petroleum Corporation |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Tax refund | 881 |  | $ 881 |
Accrued interest on potential income tax expense | $ 255 |  |  |
Arbitration Demand Filed By Andes Petroleum Ecuador Ltd |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Proceeds from settlement |  |  | $ 1,000 |
Recovery of amount awarded in settlement amount (as a percent) |  |  | 60.00% |
Claim to a settlement amount (as a percent) |  | 40.00% |  |
Own economic interest (as a percent) |  | 60.00% |  |
Tronox Settlement |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Payments for settlement |  |  |  | $ 5,200

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