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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Net revenue recognized from performance obligations	$ 8
Remaining performance obligations	4,153
Allowance for credit losses	$ 93
Rig Technologies [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Net revenue recognized from performance obligations		$ 74

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
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No definition available.

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