FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Other current assets	$ 110	$ 161
Other assets	1,956	1,987
Investment securities (current and long-term):
Alternative Investments, Fair Value Disclosure	76	75
Derivatives:
Derivative Asset	132	14
Derivatives: [Abstract]
Derivative Liability	44	86
Level 1
Investment securities (current and long-term):
Available-for-sale Securities	27	24
Trust Assets Fair Value Disclosure	12	7
Derivatives:
Derivative Asset	8	1
Contingent receivable	0
Total assets	47	32
Derivatives: [Abstract]
Derivative Liability	2	7
Discontinued Operation, Contingent Payable	0
Long-term debt, including current portion	0	0
Total liabilities	2	7
Level 2
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	118	112
Derivatives:
Derivative Asset	184	19
Contingent receivable	0
Total assets	302	131
Derivatives: [Abstract]
Derivative Liability	56	85
Discontinued Operation, Contingent Payable	23
Long-term debt, including current portion	15,196	13,987
Total liabilities	15,275	14,072
Level 3
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	0	0
Derivatives:
Derivative Asset	0	0
Contingent receivable	135
Total assets	135	0
Derivatives: [Abstract]
Derivative Liability	0	0
Discontinued Operation, Contingent Payable	0
Long-term debt, including current portion	0	0
Total liabilities	0	0
Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Available-for-sale Securities	50	47
Trust Assets Fair Value Disclosure	183	171
Derivatives:
Derivative Asset	192	20
Contingent receivable	150
Derivatives: [Abstract]
Derivative Liability	58	92
Discontinued Operation, Contingent Payable	23
Long-term debt, including current portion	16,027	20,428
Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Available-for-sale Securities	50	47
Trust Assets Fair Value Disclosure	183	171
Derivatives:
Derivative Asset	192	20
Contingent receivable	135
Total assets	560	238
Derivatives: [Abstract]
Derivative Liability	58	92
Discontinued Operation, Contingent Payable	23
Long-term debt, including current portion	15,196	13,987
Total liabilities	15,277	14,079
Embedded Derivative Financial Instruments [Member] \| Level 1
Derivatives: [Abstract]
Derivative Liability		0
Embedded Derivative Financial Instruments [Member] \| Level 2
Derivatives: [Abstract]
Derivative Liability		81
Embedded Derivative Financial Instruments [Member] \| Level 3
Derivatives: [Abstract]
Derivative Liability		0
Embedded Derivative Financial Instruments [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Derivatives: [Abstract]
Derivative Liability		81
Embedded Derivative Financial Instruments [Member] \| Estimate of Fair Value Measurement [Member]
Derivatives: [Abstract]
Derivative Liability		81
Embedded Derivative Financial Instruments [Member]
Derivatives:
Derivative Asset	125	14
Derivatives: [Abstract]
Derivative Liability	44	76
Embedded Derivative Financial Instruments [Member] \| Level 1
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0
Embedded Derivative Financial Instruments [Member] \| Level 2
Derivatives:
Derivative Asset	137	19
Derivatives: [Abstract]
Derivative Liability	56
Embedded Derivative Financial Instruments [Member] \| Level 3
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0
Embedded Derivative Financial Instruments [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	137	19
Derivatives: [Abstract]
Derivative Liability	56
Embedded Derivative Financial Instruments [Member] \| Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	137	19
Derivatives: [Abstract]
Derivative Liability	56
Copper futures and swap contracts [Member]
Derivatives:
Derivative Asset	7	0
Derivatives: [Abstract]
Derivative Liability	0	10
Copper futures and swap contracts [Member] \| Level 1
Derivatives:
Derivative Asset	8	1
Derivatives: [Abstract]
Derivative Liability	2
Copper futures and swap contracts [Member] \| Level 2
Derivatives:
Derivative Asset	1	0
Derivatives: [Abstract]
Derivative Liability	0
Copper futures and swap contracts [Member] \| Level 3
Derivatives:
Derivative Asset	0	0
Derivatives: [Abstract]
Derivative Liability	0
Copper futures and swap contracts [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	9	1
Derivatives: [Abstract]
Derivative Liability	2
Copper futures and swap contracts [Member] \| Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	9	1
Derivatives: [Abstract]
Derivative Liability	2
Africa and onshore California [Member] \| Copper futures and swap contracts [Member] \| Level 1
Derivatives:
Derivative Asset	0
Africa and onshore California [Member] \| Copper futures and swap contracts [Member] \| Level 2
Derivatives:
Derivative Asset	46
Africa and onshore California [Member] \| Copper futures and swap contracts [Member] \| Level 3
Derivatives:
Derivative Asset	0
Africa and onshore California [Member] \| Copper futures and swap contracts [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Derivatives:
Derivative Asset	46
Africa and onshore California [Member] \| Copper futures and swap contracts [Member] \| Estimate of Fair Value Measurement [Member]
Derivatives:
Derivative Asset	46
U.S. core fixed income fund [Member] \| Level 1
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund [Member] \| Level 2
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund [Member] \| Level 3
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	0	0
U.S. core fixed income fund [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Available-for-sale Securities	23	23
Trust Assets Fair Value Disclosure	53	52
U.S. core fixed income fund [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Available-for-sale Securities	23	23
Trust Assets Fair Value Disclosure	53	52
Money market funds [Member] \| Level 1
Investment securities (current and long-term):
Available-for-sale Securities	22	21
Trust Assets Fair Value Disclosure	12	7
Money market funds [Member] \| Level 2
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	0	0
Money market funds [Member] \| Level 3
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Trust Assets Fair Value Disclosure	0	0
Money market funds [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Available-for-sale Securities	22	21
Trust Assets Fair Value Disclosure	12	7
Money market funds [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Available-for-sale Securities	22	21
Trust Assets Fair Value Disclosure	12	7
Equity securities \| Level 1
Investment securities (current and long-term):
Available-for-sale Securities	5	3
Equity securities \| Level 2
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Equity securities \| Level 3
Investment securities (current and long-term):
Available-for-sale Securities	0	0
Equity securities \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Available-for-sale Securities	5	3
Equity securities \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Available-for-sale Securities	5	3
Government bonds \| Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government bonds \| Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	36	37
Government bonds \| Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government bonds \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	36	37
Government bonds \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	36	37
Government mortgage-backed securities [Member] \| Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities [Member] \| Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	25	28
Government mortgage-backed securities [Member] \| Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Government mortgage-backed securities [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	25	28
Government mortgage-backed securities [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	25	28
Corporate bonds [Member] \| Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Corporate bonds [Member] \| Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	32	26
Corporate bonds [Member] \| Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Corporate bonds [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	32	26
Corporate bonds [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	32	26
Asset-backed securities [Member] \| Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities [Member] \| Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	16	13
Asset-backed securities [Member] \| Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Asset-backed securities [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	16	13
Asset-backed securities [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	16	13
Collateralized Mortgage Backed Securities [Member] \| Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Collateralized Mortgage Backed Securities [Member] \| Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	8	7
Collateralized Mortgage Backed Securities [Member] \| Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Collateralized Mortgage Backed Securities [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	8	7
Collateralized Mortgage Backed Securities [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	8	7
Municipal bonds [Member] \| Level 1
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Municipal bonds [Member] \| Level 2
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1	1
Municipal bonds [Member] \| Level 3
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	0	0
Municipal bonds [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1	1
Municipal bonds [Member] \| Estimate of Fair Value Measurement [Member]
Investment securities (current and long-term):
Trust Assets Fair Value Disclosure	1	1
Copper futures and swap contracts [Member] \| Level 1
Derivatives: [Abstract]
Derivative Liability		7
Copper futures and swap contracts [Member] \| Level 2
Derivatives: [Abstract]
Derivative Liability		4
Copper futures and swap contracts [Member] \| Level 3
Derivatives: [Abstract]
Derivative Liability		0
Copper futures and swap contracts [Member] \| Carrying Amount, Fair Value Disclosure [Member]
Derivatives: [Abstract]
Derivative Liability		11
Copper futures and swap contracts [Member] \| Estimate of Fair Value Measurement [Member]
Derivatives: [Abstract]
Derivative Liability		11
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	28	28
Other assets	122	118
Investment Securities [Member]
Investment securities (current and long-term):
Alternative Investments, Fair Value Disclosure	23	23
Investment Securities [Member] \| U.S. core fixed income fund [Member]
Investment securities (current and long-term):
Alternative Investments, Fair Value Disclosure	23	23
Restricted Funds [Member]
Investment securities (current and long-term):
Alternative Investments, Fair Value Disclosure	53	52
Restricted Funds [Member] \| U.S. core fixed income fund [Member]
Investment securities (current and long-term):
Alternative Investments, Fair Value Disclosure	$ 53	$ 52

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