STOCKHOLDERS’ EQUITY - Stock Options Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stockholders Equity Note [Line Items]
Percentage of common stock retained	100.00%
Employee stock option
Stockholders Equity Note [Line Items]
Target service period	3 years
Stock repurchase program, period in force	6 months
Stock options granted contractual term	10 years
Total intrinsic value of stock options exercised	$ 131	$ 272	$ 222
Unrecognized compensation cost related to all unvested	$ 60
Weighted-average period for all unvested	1 year 9 months 18 days

Stockholders equity note.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Description of terms of award under share-based payment arrangement.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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