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EQUITY - TOTAL OUTSTANDING SHARES (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Shares Outstanding [Roll Forward]      
Beginning Balance (in shares) 223.0 226.8 230.1
Shares of treasury stock issued (in shares) 3.1 1.6 2.9
Repurchase of common stock at an average cost (in shares) (4.8) (5.4) (6.2)
Ending Balance (in shares) 221.3 223.0 226.8
Stock repurchased under the repurchase program, average price (in dollars per share) $ 54.18 $ 45.92 $ 64.40
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) 41.5 37.7 34.4
Shares of treasury stock issued (in shares) 3.1 1.6 2.9
Repurchase of common stock at an average cost (in shares) (4.8) (5.4) (6.2)
Ending Balance (in shares) 43.2 41.5 37.7