RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details)	12 Months Ended			24 Months Ended
	Dec. 31, 2015 USD ($) person	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) person
DEFINED CONTRIBUTION PLANS
Accrued liabilities for the supplemental retirement plan	$ 175,000,000	$ 163,000,000		$ 175,000,000
Expenses under provisions of defined contribution and supplemental retirement plans	136,000,000	146,000,000	$ 140,000,000
Postretirement and Other Benefit Plans Disclosure
Total benefit costs including postretirement costs	200,000,000	215,000,000	229,000,000
AOCI included the following after-tax balances
AOCI after-tax balances	291,000,000	339,000,000		291,000,000
Spin-off California Resources Corp
Postretirement and Other Benefit Plans Disclosure
Increase (Decrease) in Postretirement Obligations	15,000,000	72,000,000
Increase (Decrease) in Deferred Income Taxes	14,000,000
Increase (decrease) in other comprehensive income	36,000,000
Pension Benefit
Postretirement and Other Benefit Plans Disclosure
Employer contributions		7,000,000
Increase (Decrease) in Pension Plan Obligations	5,000,000
Amounts recognized in the consolidated balance sheets
Other assets	45,000,000	57,000,000		45,000,000
Accrued liabilities	(7,000,000)	(6,000,000)		(7,000,000)
Deferred credits and other liabilities - other	(65,000,000)	(68,000,000)		(65,000,000)
Amounts recognized in the consolidated balance sheets, total	(27,000,000)	(17,000,000)		(27,000,000)
AOCI included the following after-tax balances
Net loss	93,000,000	83,000,000		93,000,000
AOCI after-tax balances	93,000,000	83,000,000		93,000,000
Changes in the benefit obligation:
Benefit obligation - beginning of year	453,000,000	523,000,000		523,000,000
Actuarial (gain) loss	(16,000,000)	53,000,000
Foreign currency exchange rate (gain) loss	(9,000,000)	(9,000,000)
Spin-off of California Resources		(105,000,000)
Benefits paid	(42,000,000)	(43,000,000)
Benefit obligation - end of year	411,000,000	453,000,000	523,000,000	411,000,000
Changes in plan assets:
Fair value of plan assets - beginning of year	436,000,000	538,000,000		538,000,000
Actual return on plan assets	(21,000,000)	24,000,000
Spin-off of California Resources	11,000,000	(90,000,000)
Benefits paid	(42,000,000)	(43,000,000)
Fair value of plan assets - end of year	384,000,000	436,000,000	538,000,000	384,000,000
Funded/(Unfunded) status:	(27,000,000)	(17,000,000)		(27,000,000)
Pension plans with accumulated benefit obligations in excess of plan assets
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation	160,000,000	173,000,000		160,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	156,000,000	168,000,000		156,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets	88,000,000	100,000,000		88,000,000
Pension plans with plan assets in excess of accumulated benefit obligations
Pension plans with plan assets in excess of accumulated benefit obligations, projected benefit obligation	251,000,000	280,000,000		251,000,000
Pension plans with plan assets in excess of accumulated benefit obligations, accumulated benefit obligation	251,000,000	280,000,000		251,000,000
Pension plans with plan assets in excess of accumulated benefit obligations, fair value of plan assets	296,000,000	336,000,000		$ 296,000,000
Net periodic benefit costs:
Service cost	7,000,000	11,000,000	13,000,000
Interest cost	18,000,000	23,000,000	24,000,000
Expected return on plan assets	(27,000,000)	(33,000,000)	(31,000,000)
Recognized actuarial loss	10,000,000	6,000,000	19,000,000
Other costs and adjustments	(4,000,000)	(8,000,000)	(13,000,000)
Net periodic benefit cost	4,000,000	$ (1,000,000)	12,000,000
Amounts that will be amortized from accumulated other comprehensive income (Loss) in next fiscal year
Estimated net loss that will be amortized from AOCI into net periodic benefit cost over the next fiscal year	13,000,000
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year	$ 0
Benefit Obligation Assumptions:
Discount rate (as a percent)	4.14%	3.81%		4.14%
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)	3.81%	4.45%
Assumed long tem rate of return on assets in excess of inflation (as a percent)	6.50%	6.50%
Rate of compensation increase (as a percent)		4.00%
Domestic Pension Benefits
Postretirement and Other Benefit Plans Disclosure
Number of employees accruing benefits under defined benefit plans | person	600			600
Foreign Pension Plans
Postretirement and Other Benefit Plans Disclosure
Number of employees accruing benefits under defined benefit plans | person	1,200			1,200
Foreign Pension Plans | High end of range
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)				10.00%
Rate of compensation increase (as a percent)	10.00%
Foreign Pension Plans | Low end of range
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)				1.50%
Rate of compensation increase (as a percent)	1.50%
Postretirement Benefit
Postretirement and Other Benefit Plans Disclosure
Increase (Decrease) in Postretirement Obligations	$ 23,000,000
Amounts recognized in the consolidated balance sheets
Accrued liabilities	(58,000,000)	$ (57,000,000)		$ (58,000,000)
Deferred credits and other liabilities - other	(921,000,000)	(980,000,000)		(921,000,000)
Amounts recognized in the consolidated balance sheets, total	(979,000,000)	(1,037,000,000)		(979,000,000)
AOCI included the following after-tax balances
Net loss	197,000,000	255,000,000		197,000,000
Prior service cost	1,000,000	1,000,000		1,000,000
AOCI after-tax balances	198,000,000	256,000,000		198,000,000
Changes in the benefit obligation:
Benefit obligation - beginning of year	1,036,000,000	1,016,000,000		1,016,000,000
Actuarial (gain) loss	(66,000,000)	83,000,000
Spin-off of California Resources		(72,000,000)
Benefits paid	(57,000,000)	(59,000,000)
Benefit obligation - end of year	979,000,000	1,036,000,000	1,016,000,000	979,000,000
Changes in plan assets:
Funded/(Unfunded) status:	(979,000,000)	(1,036,000,000)		$ (979,000,000)
Net periodic benefit costs:
Service cost	26,000,000	24,000,000	29,000,000
Interest cost	40,000,000	44,000,000	43,000,000
Recognized actuarial loss	27,000,000	20,000,000	38,000,000
Other costs and adjustments	1,000,000	1,000,000	1,000,000
Net periodic benefit cost	94,000,000	$ 89,000,000	$ 111,000,000
Amounts that will be amortized from accumulated other comprehensive income (Loss) in next fiscal year
Estimated net loss that will be amortized from AOCI into net periodic benefit cost over the next fiscal year	20,000,000
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year	$ 1,000,000
Benefit Obligation Assumptions:
Discount rate (as a percent)	4.36%	3.99%		4.36%
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)	3.99%	4.75%
Assumed health care cost trend rates
Consumer Price Index (CPI) increase (as a percent)	1.60%	1.79%
Projected annual rates of health care cost trend rates (as a percent)	7.50%
Projected ultimate health care cost trend rates (as a percent)	5.00%
Year the projected health care cost trend rate reaches ultimate trend rate	2025			2025
Increase (decrease) in projected annual rates of health care cost trend rates (as a percent)	(0.25%)
Effect of 1-percent increase or a 1-percent decrease in these assumed health care cost trend rates
Effect of 1-percent increase in assumed health care cost trend rates on postretirement benefit obligation	$ 55,000,000
Effect of 1-percent decrease in assumed health care cost trend rates on postretirement benefit obligation	$ 46,000,000