Share-based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period for stock options from the date of grant	3 years
Vesting period for outstanding restricted common stock from the date of grant	3 years
Option term (in years)	10 years
Performance of predetermined peer companies	3 years
Minimum PSU awards payout	0.00%hes_MinimumPsuAwardPayout
Maximum PSU awards payout	200.00%hes_MaximumPsuAwardPayout
Reversed share-based compensation expense related to grants that are expected to be forfeited		$ 33
Unearned compensation expense, before income taxes due 2015	66
Unearned compensation expense, before income taxes due 2016	39
Unearned compensation expense, before income taxes due 2017	7
Long-term Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Available for future awards of restricted stock, stock options and PSUs	8.5
Common stock authorized for issuance	29.0
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reversed share-based compensation expense related to grants that are expected to be forfeited		25
Performance Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reversed share-based compensation expense related to grants that are expected to be forfeited		7
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reversed share-based compensation expense related to grants that are expected to be forfeited		$ 1

Employee service share based compensation unrecognized compensation costs on nonvested awards due in 2014.

No definition available.

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- Definition

Employee service share based compensation unrecognized compensation costs on nonvested awards due within twelve months.

+ References

No definition available.

+ Details

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- Definition

Employee service share based compensation unrecognized compensation costs on nonvested awards due in 2013.

+ References

No definition available.

+ Details

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- Definition

Maximum PSU award payout.

+ References

No definition available.

+ Details

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

No definition available.

+ Details

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- Definition

Minimum PSU award payout.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Period for comparison of total shareholder return.

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Award Expiration Term

+ References

No definition available.

+ Details

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- Definition

Reversed share-based compensation expense related to grants that are expected to be forfeited.

+ References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Details

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- Details

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