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Subsequent Event - Additional Information (Detail) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Mar. 04, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash consideration received in lieu of cancellation		$ 203	$ 1,289
Subsequent Event [Member]
Cancellation of common shares	350,000
Stock-based compensation awards, common shares	138,027
Cash consideration received in lieu of cancellation	$ 42

X

- Definition

The cash outflow to reacquire common stock during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
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- Definition

Number of shares purchased for issuance under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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