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SHARE-BASED PAYMENT - Plan Information (Details)
shares in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
shares
Dec. 31, 2016
item
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
2015 Equity Incentive Plan        
Share-Based Payment        
Number of shares of stock authorized for issuance   8.5    
Number of shares remaining available for grant   2.9    
PSPs | RSUs | Officers And Employees        
Share-Based Payment        
Granted (in shares)   0.5 0.0 0.6
2014 PSP | RSUs        
Share-Based Payment        
Number of performance targets | item   2    
Performance shares vested 0.6      
2016 PSP | RSUs        
Share-Based Payment        
Number of performance targets | item   3