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DEBT - Debt Extinguishment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instruments [Line Items] |  |  |
Gain (Loss) on Extinguishment of Debt | $ (27) | $ 7 | $ 21
Senior Notes [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 2,145 | 454 | 1,234
DebtIssuanceCostsandFairValueAdjustments | 30 | 26 | 49
Extinguishment of Debt, Amount | 2,175 | 480 | 1,283
Extinguishment Of Debt, Redemption Value | 2,201 | 470 | 1,257
Gain (Loss) on Extinguishment of Debt | 26 | (10) | (26)
Senior Notes [Member] | 3.100% Senior Notes due March 2020 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 1,000 |  |
DebtIssuanceCostsandFairValueAdjustments | (2) |  |
Extinguishment of Debt, Amount | 998 |  |
Extinguishment Of Debt, Redemption Value | 1,003 |  |
Gain (Loss) on Extinguishment of Debt | 5 |  |
Senior Notes [Member] | Senior Notes Due 2022 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  | 404 |
DebtIssuanceCostsandFairValueAdjustments |  | 22 |
Extinguishment of Debt, Amount |  | 426 |
Extinguishment Of Debt, Redemption Value |  | 418 |
Gain (Loss) on Extinguishment of Debt |  | (8) |
Senior Notes [Member] | 2.375% Senior Notes due March 2018 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 74
DebtIssuanceCostsandFairValueAdjustments |  |  | 0
Extinguishment of Debt, Amount |  |  | 74
Extinguishment Of Debt, Redemption Value |  |  | 74
Gain (Loss) on Extinguishment of Debt |  |  | 0
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 179
DebtIssuanceCostsandFairValueAdjustments |  |  | 5
Extinguishment of Debt, Amount |  |  | 184
Extinguishment Of Debt, Redemption Value |  |  | 182
Gain (Loss) on Extinguishment of Debt |  |  | (2)
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 552
DebtIssuanceCostsandFairValueAdjustments |  |  | 23
Extinguishment of Debt, Amount |  |  | 575
Extinguishment Of Debt, Redemption Value |  |  | 562
Gain (Loss) on Extinguishment of Debt |  |  | (13)
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 228
DebtIssuanceCostsandFairValueAdjustments |  |  | 12
Extinguishment of Debt, Amount |  |  | 240
Extinguishment Of Debt, Redemption Value |  |  | 234
Gain (Loss) on Extinguishment of Debt |  |  | (6)
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 12 |  |
DebtIssuanceCostsandFairValueAdjustments | 0 |  |
Extinguishment of Debt, Amount | 12 |  |
Extinguishment Of Debt, Redemption Value | 12 |  |
Gain (Loss) on Extinguishment of Debt | 0 |  |
Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  | 50 |
DebtIssuanceCostsandFairValueAdjustments |  | 4 |
Extinguishment of Debt, Amount |  | 54 |
Extinguishment Of Debt, Redemption Value |  | 52 |
Gain (Loss) on Extinguishment of Debt |  | $ (2) |
Senior Notes [Member] | Senior Notes Due 2023 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 728 |  |
DebtIssuanceCostsandFairValueAdjustments | 34 |  |
Extinguishment of Debt, Amount | 762 |  |
Extinguishment Of Debt, Redemption Value | 768 |  |
Gain (Loss) on Extinguishment of Debt | 6 |  |
Senior Notes [Member] | Senior Notes Due 2021 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount | 405 |  |
DebtIssuanceCostsandFairValueAdjustments | (2) |  |
Extinguishment of Debt, Amount | 403 |  |
Extinguishment Of Debt, Redemption Value | 418 |  |
Gain (Loss) on Extinguishment of Debt | $ 15 |  |
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 58
DebtIssuanceCostsandFairValueAdjustments |  |  | 2
Extinguishment of Debt, Amount |  |  | 60
Extinguishment Of Debt, Redemption Value |  |  | 59
Gain (Loss) on Extinguishment of Debt |  |  | (1)
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 65
DebtIssuanceCostsandFairValueAdjustments |  |  | 3
Extinguishment of Debt, Amount |  |  | 68
Extinguishment Of Debt, Redemption Value |  |  | 66
Gain (Loss) on Extinguishment of Debt |  |  | (2)
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 33
DebtIssuanceCostsandFairValueAdjustments |  |  | 2
Extinguishment of Debt, Amount |  |  | 35
Extinguishment Of Debt, Redemption Value |  |  | 34
Gain (Loss) on Extinguishment of Debt |  |  | (1)
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | 45
DebtIssuanceCostsandFairValueAdjustments |  |  | 2
Extinguishment of Debt, Amount |  |  | 47
Extinguishment Of Debt, Redemption Value |  |  | 46
Gain (Loss) on Extinguishment of Debt |  |  | $ (1)

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