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Commitments and Contingencies - Commitments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitment And Contingencies [Line Items]
Royalty expense	$ 505	$ 403	$ 536
Maximum [Member]
Commitment And Contingencies [Line Items]
Milestone contingent expense	$ 509

X

- Definition

Commitment And Contingencies [Line Items]

+ References

No definition available.

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- Definition

Milestone Contingent Payments

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- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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