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EARNINGS PER COMMON SHARE - ADDITIONAL INFORMATION (Details) - USD ($) $ / shares in Thousands, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 28, 2021
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) | 0.9 |  | 3.5 |  |  |  |  |
Earnings per share, potentially dilutive securities excluded from computation of earnings per share (in shares) |  |  |  |  |  |  | 0.9 |
Treasury stock, shares, acquired (in shares) |  |  |  |  |  | 1.5 |  |
Treasury shares purchased |  | $ 90 |  | $ 0 | $ 140 | $ 90 |  |
Treasury stock acquired, average cost per share (in usd per share) |  |  |  |  |  | $ 60,620 |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 1,000
Stock Options And Restricted Stock Units |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) |  |  |  |  |  | 0.9 |  |
Common Stock |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares) |  |  |  |  |  |  | 3.2 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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