FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other current assets	$ 523	$ 341
Other assets	1,460	1,560
Derivative Liability, Fair Value, Gross Liability	28	21
Derivatives:
Derivative Asset	73	183
Derivatives: [Abstract]
Derivative Liability	24	20
NAV
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	29	29
Assets [Abstract]
Trust Assets Fair Value Disclosure	64	65
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	50	7
Assets [Abstract]
Trust Assets Fair Value Disclosure	8	5
Derivatives:
Derivative Asset	10	13
Contingent receivable	0	0
Derivatives: [Abstract]
Derivative Liability	1
Long-term debt, including current portion	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Assets [Abstract]
Trust Assets Fair Value Disclosure	137	143
Derivatives:
Derivative Asset	67	171
Contingent receivable	0	0
Derivatives: [Abstract]
Derivative Liability	27
Long-term debt, including current portion	10,630	10,994
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	0	0
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Derivatives:
Derivative Asset	0	0
Contingent receivable	81	88
Derivatives: [Abstract]
Derivative Liability	0
Long-term debt, including current portion	0	0
Carrying Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	79	36
Assets [Abstract]
Trust Assets Fair Value Disclosure	209	213
Derivatives:
Derivative Asset	77	184
Contingent receivable	90	108
Derivatives: [Abstract]
Derivative Liability	28
Long-term debt, including current portion	9,450	9,711
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Investments, Fair Value Disclosure	79	36
Assets [Abstract]
Trust Assets Fair Value Disclosure	209	213
Derivatives:
Derivative Asset	77	184
Contingent receivable	81	88
Derivatives: [Abstract]
Derivative Liability	28
Long-term debt, including current portion	10,630	10,994
Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Derivative Liability, Fair Value, Gross Liability	27	21
Derivatives:
Derivative Asset	61	168
Derivatives: [Abstract]
Derivative Liability	24	20
Embedded Derivative Financial Instruments [Member] | Level 1
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Embedded Derivative Financial Instruments [Member] | Level 2
Derivatives:
Derivative Asset	64	169
Derivatives: [Abstract]
Derivative Liability	27	21
Embedded Derivative Financial Instruments [Member] | Level 3
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0	0
Embedded Derivative Financial Instruments [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	64	169
Derivatives: [Abstract]
Derivative Liability	27	21
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	64	169
Derivatives: [Abstract]
Derivative Liability	27	21
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Derivative Liability, Fair Value, Gross Liability	1	0
Derivatives:
Derivative Asset	12	15
Derivatives: [Abstract]
Derivative Liability	0	0
Commodity Contract [Member] | Level 1
Derivatives:
Derivative Asset	1
Derivatives: [Abstract]
Derivative Liability	1
Commodity Contract [Member] | Level 2
Derivatives:
Derivative Asset	0
Derivatives: [Abstract]
Derivative Liability	0
Commodity Contract [Member] | Level 3
Derivatives:
Derivative Asset	0
Derivatives: [Abstract]
Derivative Liability	0
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	1
Derivatives: [Abstract]
Derivative Liability	1
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	1
Derivatives: [Abstract]
Derivative Liability	1
Future [Member] | Level 1
Derivatives:
Derivative Asset	9	13
Future [Member] | Level 2
Derivatives:
Derivative Asset	3	2
Future [Member] | Level 3
Derivatives:
Derivative Asset	0
Future [Member] | Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	12	15
Future [Member] | Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	12	15
U.S. core fixed income fund [Member] | NAV
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	29	29
Assets [Abstract]
Trust Assets Fair Value Disclosure	64	65
U.S. core fixed income fund [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	0	0
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	0	0
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	0	0
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	29	29
Assets [Abstract]
Trust Assets Fair Value Disclosure	64	65
U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	29	29
Assets [Abstract]
Trust Assets Fair Value Disclosure	64	65
Money market funds [Member] | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	8	5
Money market funds [Member] | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Money market funds [Member] | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	8	5
Money market funds [Member] | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	8	5
Equity securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	50	7
Equity securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	0	0
Equity securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	0	0
Equity securities | Carrying Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	50	7
Equity securities | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Marketable Securities	50	7
Government bonds | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government bonds | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	53	49
Government bonds | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government bonds | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	53	49
Government bonds | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	53	49
Government mortgage-backed securities [Member] | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities [Member] | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	20	30
Government mortgage-backed securities [Member] | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	20	30
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	20	30
Corporate bonds [Member] | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Corporate bonds [Member] | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	45	43
Corporate bonds [Member] | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	45	43
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	45	43
Asset-backed securities [Member] | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities [Member] | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	18	16
Asset-backed securities [Member] | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	18	16
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	18	16
Collateralized Mortgage Backed Securities [Member] | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure		0
Collateralized Mortgage Backed Securities [Member] | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure		4
Collateralized Mortgage Backed Securities [Member] | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure		0
Collateralized Mortgage Backed Securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure		4
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure		4
Municipal bonds [Member] | Level 1
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Municipal bonds [Member] | Level 2
Assets [Abstract]
Trust Assets Fair Value Disclosure	1	1
Municipal bonds [Member] | Level 3
Assets [Abstract]
Trust Assets Fair Value Disclosure	0	0
Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	1	1
Municipal bonds [Member] | Estimate of Fair Value Measurement [Member]
Assets [Abstract]
Trust Assets Fair Value Disclosure	1	1
Bank Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other current assets	114	97
Other assets	132	148
Derivatives Not Designated as Hedging Instruments | Embedded Derivative Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Derivative Liability, Fair Value, Gross Liability	27	21
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico Interests
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other current assets	20	12
Other assets	$ 70	$ 96
Derivatives:
Contingent receivable			$ 150