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EARNINGS PER COMMON SHARE - ADDITIONAL INFORMATION (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Line Items]
Treasury stock, shares, acquired (in shares)	1.5
Treasury shares purchased	$ 90	$ 140
Treasury stock acquired, average cost per share (in usd per share)	$ 60.62
Earnings Per Share, Potentially Dilutive Securities		1.4 million
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)	0.8
Common Stock
Earnings Per Share [Line Items]
Antidilutive common stock options not included in the computation of diluted earnings per common share (in shares)		2.6

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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.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would have been antidilutive for the period presented.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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