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EQUITY - TOTAL OUTSTANDING SHARES (Details) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Shares Outstanding [Roll Forward]
Beginning balance (in shares)	221.3	223.0	226.8
Shares of treasury stock issued (in shares)	1.1	3.1	1.6
Repurchase of common stock at an average cost (in shares)	(3.7)	(4.8)	(5.4)
Ending balance (in shares)	218.7	221.3	223.0
Stock repurchased under the repurchase program, average price (in dollars per share)	$ 38.25	$ 54.18	$ 45.92
Common Stock
Increase (Decrease) in Shares Outstanding [Roll Forward]
Beginning balance (in shares)	264.5	264.5	264.5
Shares of treasury stock issued (in shares)	0.0	0.0	0.0
Repurchase of common stock at an average cost (in shares)	0.0	0.0	0.0
Ending balance (in shares)	264.5	264.5	264.5
Treasury Stock
Increase (Decrease) in Shares Outstanding [Roll Forward]
Beginning balance (in shares)	43.2	41.5	37.7
Shares of treasury stock issued (in shares)	1.1	3.1	1.6
Repurchase of common stock at an average cost (in shares)	(3.7)	(4.8)	(5.4)
Ending balance (in shares)	45.8	43.2	41.5

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

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Number of treasury shares or units reissued. Excludes reissuance of shares or units in treasury for award under share-based payment arrangement.

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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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