Stock Incentive Plan - Summary of Stock Options Activity (Details)	12 Months Ended
Dec. 31, 2020 shares
SOs
Outstanding at December 31, 2019 (in shares)	283,531,000,000
Exercised (in shares)	(16,347,000,000)
Cancelled/Forfeited/Expired (in shares)	(35,158,000,000)
Outstanding at December 31, 2020 (in shares)	232,026,000,000

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

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