Retirement and Postretirement Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
DEFINED CONTRIBUTION PLANS
Accrued liabilities for the supplemental retirement plan	$ 163,000,000	$ 166,000,000
Expenses under provisions of defined contribution and supplemental retirement plans	146,000,000	140,000,000	137,000,000
Postretirement and Other Benefit Plans Disclosure
Total benefit costs including postretirement costs	215,000,000	229,000,000	218,000,000
AOCI included the following after-tax balances
AOCI after-tax balances	339,000,000	284,000,000
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
Increase (Decrease) in Pension Plan Obligations	27,000,000
Amounts recognized in the consolidated balance sheets
Other assets	57,000,000	104,000,000
Accrued liabilities	(6,000,000)	(6,000,000)
Deferred credits and other liabilities - other	(68,000,000)	(83,000,000)
Amounts recognized in the consolidated balance sheets, total	(17,000,000)	15,000,000
AOCI included the following after-tax balances
Net loss	83,000,000	66,000,000
Prior service cost		1,000,000
AOCI after-tax balances	83,000,000	67,000,000
Changes in the benefit obligation:
Benefit obligation - beginning of year	523,000,000	615,000,000
Service cost	11,000,000	13,000,000	13,000,000
Interest cost	23,000,000	24,000,000	27,000,000
Actuarial (gain) loss	53,000,000	(35,000,000)
Foreign currency exchange rate (gain) loss	(9,000,000)	(5,000,000)
Spin-off of California Resources	(105,000,000)
Benefits paid	(43,000,000)	(54,000,000)
Settlements		(35,000,000)
Benefit obligation - end of year	453,000,000	523,000,000	615,000,000
Changes in plan assets:
Fair value of plan assets - beginning of year	538,000,000	499,000,000
Actual return on plan assets	24,000,000	88,000,000
Employer contributions	7,000,000	29,000,000
Spin-off of California Resources	(90,000,000)
Benefits paid	(43,000,000)	(54,000,000)
Settlements		(24,000,000)
Fair value of plan assets - end of year	436,000,000	538,000,000	499,000,000
Funded/(Unfunded) status:	(17,000,000)	15,000,000
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	173,000,000	122,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	168,000,000	112,000,000
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets	100,000,000	39,000,000
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	280,000,000	401,000,000
Pension plans with plan assets in excess of accumulated benefit obligations, accumulated benefit obligation	280,000,000	386,000,000
Pension plans with plan assets in excess of accumulated benefit obligations, fair value of plan assets	336,000,000	499,000,000
Net periodic benefit costs:
Service cost	11,000,000	13,000,000	13,000,000
Interest cost	23,000,000	24,000,000	27,000,000
Expected return on plan assets	(33,000,000)	(31,000,000)	(31,000,000)
Recognized actuarial loss	6,000,000	19,000,000	19,000,000
Other costs and adjustments	(8,000,000)	(13,000,000)	17,000,000
Net periodic benefit cost	(1,000,000)	12,000,000	45,000,000
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	10,000,000
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)	3.81%	4.45%
Rate of compensation increase (as a percent)		4.00%
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)	4.45%	3.59%
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%	4.00%
Domestic Pension Benefits
Postretirement and Other Benefit Plans Disclosure
Number of employees accruing benefits under defined benefit plans	700
Foreign Pension Plans
Postretirement and Other Benefit Plans Disclosure
Number of employees accruing benefits under defined benefit plans	1,300
Foreign Pension Plans | High end of range
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)		10.00%	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%	1.50%
Rate of compensation increase (as a percent)	1.50%
Postretirement Benefit
Postretirement and Other Benefit Plans Disclosure
Increase (Decrease) in Postretirement Obligations	98,000,000
Amounts recognized in the consolidated balance sheets
Accrued liabilities	(57,000,000)	(58,000,000)
Deferred credits and other liabilities - other	(980,000,000)	(958,000,000)
Amounts recognized in the consolidated balance sheets, total	(1,037,000,000)	(1,016,000,000)
AOCI included the following after-tax balances
Net loss	255,000,000	225,000,000
Prior service cost	1,000,000	2,000,000
AOCI after-tax balances	256,000,000	227,000,000
Changes in the benefit obligation:
Benefit obligation - beginning of year	1,016,000,000	1,127,000,000
Service cost	24,000,000	29,000,000	25,000,000
Interest cost	44,000,000	43,000,000	42,000,000
Actuarial (gain) loss	83,000,000	(126,000,000)
Spin-off of California Resources	(72,000,000)
Benefits paid	(59,000,000)	(57,000,000)
Benefit obligation - end of year	1,036,000,000	1,016,000,000	1,127,000,000
Changes in plan assets:
Funded/(Unfunded) status:	(1,036,000,000)	(1,016,000,000)
Net periodic benefit costs:
Service cost	24,000,000	29,000,000	25,000,000
Interest cost	44,000,000	43,000,000	42,000,000
Recognized actuarial loss	20,000,000	38,000,000	37,000,000
Other costs and adjustments	1,000,000	1,000,000	1,000,000
Net periodic benefit cost	89,000,000	111,000,000	105,000,000
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	29,000,000
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)	3.99%	4.75%
Net Periodic Benefit Cost Assumptions:
Discount rate (as a percent)	4.75%	3.89%
Assumed health care cost trend rates
Consumer Price Index (CPI) increase (as a percent)	1.79%	2.36%
Projected annual rates of health care cost trend rates (as a percent)	7.75%
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
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	$ 47,000,000