Business Segment and Geographic Information (Narrative) (Details)	12 Months Ended
Dec. 31, 2019 Division Countries	Dec. 31, 2018 Countries	Dec. 31, 2017 Countries
Segment Reporting Information [Line Items]
Number of business segments \| Division	2
Number of geographic regions	4
Maximum Percentage Revenue from One Geographic Segment	10.00%	10.00%	10.00%
Maximum Percentage Property Plant and Equipment from One Geographic Segment	10.00%	10.00%
Number of Countries Exceed Revenue Threshold	1	1	1
Number of Countries Exceed Property Plant and Equipment Threshold	1	1
Property, Plant and Equipment [Member] \| UNITED STATES
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	59.00%	62.00%
Revenue Benchmark [Member] \| UNITED STATES
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	51.00%	58.00%	53.00%

The maximum percentage of property plant and equipment from one geographic location at balance sheet date.

No definition available.

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- Definition

The maximum percentage of revenue from one geographic segment for the periods presented.

+ References

No definition available.

+ Details

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- Definition

The number of business segments into which the company's operations are divided.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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Period Type:	instant

- Definition

The number of countries that exceed the property, plant and equipment threshold of 10%.

+ References

No definition available.

+ Details

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- Definition

The number of countries that exceed the revenue threshold of 10%.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

The number of geographic regions the company's operations are organized.

+ References

No definition available.

+ Details

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Namespace Prefix:	hal_
Data Type:	xbrli:integerItemType
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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