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STOCK-BASED EMPLOYEE COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Weighted-average Remaining Contractual Term |  |  |
Intrinsic value of options exercised during the period | $ 4 | $ 14 |
Executive Officers |  |  |
Number of Shares |  |  |
Granted (in shares) |  | 0 |
Stock Options |  |  |
Number of Shares |  |  |
Balance (in shares), December 31, 2020 | 152,746 |  |
Exercised (in shares) | (3,592) |  |
Forfeited (in shares) | (12,846) |  |
Balance (in shares), September 30, 2021 | 136,308 |  | 152,746
Exercisable (in shares), September 30, 2021 | 1,293 |  |
Weighted-average Exercise Price |  |  |
Balance (in dollars per share), December 31, 2020 | $ 1,401 |  |
Exercised (in dollars per share) | 1,226 |  |
Forfeited (in dollars per share) | 1,411 |  |
Balance (in dollars per share), September 30, 2021 | 1,405 |  | $ 1,401
Exercisable (in dollars per share), September 30, 2021 | $ 789 |  |
Aggregate Intrinsic Value |  |  |
Balance | $ 132 |  | $ 126
Exercisable | $ 2 |  |
Weighted-average Remaining Contractual Term |  |  |
Balance | 8 years 6 months |  | 9 years 3 months 18 days
Exercisable | 1 year 10 months 24 days |  |
Stock option term | 10 years |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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