SHARE-BASED COMPENSATION - Schedule of Stock Options Activity (Details) - Stock options $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) $ / shares shares
Options
Balance, beginning of year \| shares	5,275
Exercised \| shares	(1,441)
Forfeited or expired \| shares	(66)
Balance, end of year \| shares	3,768
Exercisable, end of year \| shares	3,768
Weighted Average Exercise Price
Balance, beginning of year \| $ / shares	$ 27.30
Exercised \| $ / shares	23.03
Forfeited or expired \| $ / shares	36.49
Balance, end of year \| $ / shares	28.82
Exercisable, end of year \| $ / shares	$ 28.82
Weighted Average Remaining Contractual Term
Balance, end of year	3 years 7 months 17 days
Exercisable, end of year	3 years 7 months 17 days
Aggregate Intrinsic Value
Balance, end of year \| $	$ 20
Exercisable, end of year \| $	$ 20

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Balance Type:	na
Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.