SHARE-BASED COMPENSATION - Schedule of Stock Options Activity (Details) - Stock options $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) $ / shares shares
Options
Balance, beginning of year	6,366
Exercised	(661)
Forfeited or expired	(430)
Balance, end of year	5,275
Exercisable, end of year	4,678
Number of options outstanding that have met the requisite service period and will be released as identified in the grant terms	324
Weighted Average Exercise Price
Balance, beginning of year \| $ / shares	$ 26.75
Exercised \| $ / shares	19.16
Forfeited or expired \| $ / shares	31.63
Balance, end of year \| $ / shares	27.30
Exercisable, end of year \| $ / shares	$ 27.84
Weighted Average Remaining Contractual Term
Balance, end of year	4 years 7 months 9 days
Exercisable, end of year	4 years 5 months 1 day
Aggregate Intrinsic Value
Balance, end of year \| $	$ 21
Exercisable, end of year \| $	$ 17

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.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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.