Retirement Plans - Change in Benefit Obligation, Fair Value of Plan Assets, and Funded Status of Pension Plans and Postretirement Medical Plan (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change In Fair Value of Plan Assets
Beginning balance	$ 2,206
Ending balance	2,284	$ 2,206
Funded Pension Plans
Change In Benefit Obligation
Beginning balance	2,321	2,450
Service cost	44	51
Interest cost	98	93
Actuarial loss (gain)	162	(156)
Benefit payments	(132)	(85)
Plan curtailments	(2)	(4)
Special termination benefits	1	1
Assumption of HOVENSA pension plan	151	0
Foreign currency exchange rate changes	(83)	(29)
Ending balance	2,560	2,321	$ 2,450
Change In Fair Value of Plan Assets
Beginning balance	2,206	2,251
Actual return on plan assets	153	28
Employer contributions	26	44
Benefit payments	(132)	(85)
Assumption of HOVENSA pension plan	126	0
Foreign currency exchange rate changes	(95)	(32)
Ending balance	2,284	2,206	2,251
Funded Status (Plan assets greater (less) than benefit obligations) at December 31	(276)	(115)
Unrecognized Net Actuarial (Gains) Losses	895	775
Unfunded Pension Plan
Change In Benefit Obligation
Beginning balance	259	278
Service cost	16	16
Interest cost	9	9
Actuarial loss (gain)	(5)	(2)
Benefit payments	(23)	(42)
Plan curtailments	0	0
Special termination benefits	0	0
Assumption of HOVENSA pension plan	0	0
Foreign currency exchange rate changes	0	0
Ending balance	256	259	278
Change In Fair Value of Plan Assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	23	42
Benefit payments	(23)	(42)
Assumption of HOVENSA pension plan	0	0
Foreign currency exchange rate changes	0	0
Ending balance	0	0	0
Funded Status (Plan assets greater (less) than benefit obligations) at December 31	(256)	(259)
Unrecognized Net Actuarial (Gains) Losses	93	105
Postretirement Medical Plan
Change In Benefit Obligation
Beginning balance	98	94
Service cost	4	4	4
Interest cost	3	3	3
Actuarial loss (gain)	(13)	5
Benefit payments	(8)	(8)
Plan curtailments	0	0
Special termination benefits	0	0
Assumption of HOVENSA pension plan	0	0
Foreign currency exchange rate changes	0	0
Ending balance	84	98	94
Change In Fair Value of Plan Assets
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	8	8
Benefit payments	(8)	(8)
Assumption of HOVENSA pension plan	0	0
Foreign currency exchange rate changes	0	0
Ending balance	0	0	$ 0
Funded Status (Plan assets greater (less) than benefit obligations) at December 31	(84)	(98)
Unrecognized Net Actuarial (Gains) Losses	$ (13)	$ 0

Defined benefit plan assumption of pension plan.

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- Definition

Defined benefit plan assumption of pension plan assets.

+ References

No definition available.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)
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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of contributions made by the employer to defined benefit plans.

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- Definition

The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

+ References

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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- Definition

Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

+ References

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

+ References

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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